You shouldn't have to do anything to break a wetsuit in, other than actually swim in it. They should be a bit tight, you should feel slight discomfort while on dry land. It shouldn't be restricting any blood flow however . The wetsuit will expand in the water. A wetsuit will stretch with use, for that reason I've heard you should really only wear it when you are ready to swim. So for that reason you shouldn't be trying to "break" it in on dry land. I think two open water swims are fine before your 1/2 ironman. It didn't sound like your suit was that tight on dry land, so I'm guessing it will be fine once you jump in. Good luck!