Advice on New Wetsuit

In general wetsuits do not "stretch out" over time much. A little perhaps, but not much.

Everyone, especially people new to wearing a neoprene wetsuit, thinks their suit is too tight at first. It usually isn't too tight.

If you did a dry-land fit, and opposed to putting it on, getting in the water and doing some swimming, then it will likely feel too tight.

Get to a pool, be certain you do a good job of getting the suit on correctly (there are a few online guides for how to do this) and practice swimming in the suit to get used to the way it feels.

Wetsuits rely on a small layer of water between you and the suit to fit and feel correct. Until you have that it will feel constricting and tight.

The best thing I did was lose about 40 pounds after I bought my wesuit.  :-)

Some wetsuits say to NOT use it in a pool.  I have an Xterra suit and it says that extensive use in a chlorinated pool can have a negative affect on the suit causing damage.

It won't hurt to swim in a pool a couple of times to make sure it fits.  You just have to wash it off.  I did that a few times to see how it feels.  Word of caution, some indoor pools are pretty warm and swimming in a wetsuit got really hot really fast.

Why is swimming in the lake not an option?

You have a westsuit, it is made to be used in cold water!

I have the DeSoto T1 (2-piece suit) and it can be sued in a pool. Though I used it in 70+ water and I was a bit too warm for my liking... So I can't imagine using it in a warm pool.

Guess this is goes in the category, you don;t have to do everything you can do.