Welcome 79S,
You'll have no problem transitioning from the 150 to the 172. Avoid carrying back seat occupants, or aft C of G's for your first flying, and you'll be fine. The 172 is a little heavier, which will mean to have to allow for a very slight delay in the affect of control inputs compared to the 150, but also, it's not upset by a gust as easily. Pay more attention to your fuel selector.
Worry not, after an hour's flying, it'll fit like a Cessna glove...