Congrats to you.

I just received my high performance endorsement today. I bought into a
Cessna 206 about three weeks ago. I don't have the retracts, but the
extra hp, cowl flaps, constant speed prop, and just plane much bigger
plane have taken a lot to get use to. Actually, I'm still not use to
it, but, this is just the license to learn and get better.

All the best, and remember... If you don't like it, go around!