Absolutely!
oooh- this is a great first post for me!

Actually, I am probably not the best influence but I have a bit of advice. First off, I don't do any other sports than running and I have never trained properly, unfortunately. With this said, I have found that a HUGE part of these distance races is mental. I did my first half at the ripe old age of 32 - Dec. 2004. I basically trained for a 10K with a few longer runs but mostly runs like you mentioned of 3-4 miles. Finished in 2:15. The next year, trained a little more - basically, for a half marathon with regular 5-6 milers and quite a few 8-10 thrown in regularly- but had convinced myself to run the full marathon this time so, even with bronchitis the previous week, still did it. Half was a still respectable 2:30 due to pacing for the full but took 6 hours to finish the whole thing. Then I got hurt skiiing (fully recovered in a few months) but was out of the running habit. Gained 20 lbs and ran on and off. Signed up for Disney 2008 Marathon in June '07 with intentions of training as it is held in January. Kind of forgot to train with my longest run being 7 miles for the previous 2 years. Mostly 3-4s. I got talked into going with the intentions of shooting for finishing the half and quitting. The downside to this is that the half is run a day earlier so I would basically be a "quitter" on the full. Saw the medal the night before and thought "I can do this!". So finished in 6:12- half was 2:40. That was 4 weeks ago (now 36) - took a week off while sore, then another week off for skiing, then ran very regularly for two weeks with a couple of 6s and one 8 miler, and this morning did the Gasparilla Half in 2:29 (almost a minute off per mile from one month ago just from consistent running for a couple of weeks). I have also now become motivated and decided to join a real running group with regular runs to keep me motivated. They also offer marathon training and I am excited to see what I can do with some proper training!
So, my recommendations are -
1) Stay consistent & train as much as possible. Join a group - it really helps. If you can't keep up, even better as it motivates you all the more. If you don't get a lot of longer runs in, try to get at least one or two in to see how your body reacts. I believe as long as you run regularly, even the shorter runs will keep your body moving. Even though I did it, I don't recommend not training properly as it really can hurt you - even permanently and then you can't run at all. Plus recovery takes a LOT longer.
2) consider a flat and mild temperature race, especially if that is where you are used to training - Florida races in the winter are great! My first half and full were the Palm Beach Marathon, which I HIGHLY recommend as it is very organized and little smaller. Great weather, well at least great temperatures (the first year was blowing rain but warm enough not to freeze) . Disney Marathon is great but the half and full are on different days. It is really an experience and I believe they keep your mind so off of running with the entertainment that it is less painful. Also plan on a VERY early morning.
3) try doing some races beforehand - especially a half marathon that is run at the same time as a full to see what to really expect.
4) don't expect to have an amazing time on your first one - just try to finish and pace yourself to do so.
5) proper equipment is VERY important
- iPod, if you like music (have somewhere to put it if you take it off as it may get annoying - I train with music but don't like it for races as the surrounding noises and talking are helpfully distracting)
- shoes - spend the money - find the right shoes - make sure they are broken in BEFORE the race
-clothing - don't wear anything new. My first race I forgot my shorts and had to buy a new pair. Ended up bleeding on the fronts of both legs by the end.
-socks - plan on having blisters! try running longer training runs with different types of socks - I like the double socks that, in theory, rub against their own layers instead of your skin
6) diet- don't change mine too much. Just make sure to drink LOTS of water for at least two weeks before the race. Even if you don't like gatorade type drinks, alternate them with water even early during the race before you feel thirsty. I take water and Gatorade and mix them while running. Become a banana lover - they really do help with cramps. Energy gels are great to have on hand for the race, too. Try some out before the race so you don't get grossed out while running. you can try the pasta thing the night before but not too late. Also, since you don't want to waste time at a portapotty once the race starts, try to get up a little early and drink some coffee so you can get your bathroom thing out of the way (this is one piece of advice no one ever likes to talk about or give but I wish someone had told me ahead of time)
7) Last, do your race and be proud of yourself - enjoy!