I gained quite a bit of muscle while on T, but I didn't gain weight--I lost. Last winter, I stopped exercising for about six weeks and was eating all sorts of junk, and I gained a bit of that weight back. Now I've lost most of it again. Bear in mind that I'm middle-aged and have gotten to the point where I'm going to have trouble losing anyway. If you're in pretty good shape before you start T and don't eat lots of junk, then just keep it going. But as Silver says, weight gain isn't necessarily bad; muscle weighs more than fat.
At this same weight as a female, I thought I looked pretty terrible. As a guy, I look fine--a little heavy set, but about average. I much prefer it. Of course, I've had top surgery. That helps.
I didn't get acne. I mean, I got a zit every now and then, but that used to happen before T. I suppose I got a few more on T, but not enough to matter. I have a friend whose acne was pretty bad, and another friend who didn't really have a problem. A number of other guys I know say that they had acne problems, but it didn't really show--I guess because they knew in advance and attacked it early with anti-acne products. I know a lot of trans guys. Only one has had really bad, visible, lasting acne. He's only been on T for two years.
Dominick, T works a little differently for different guys. It's unpredictable, and it isn't for everyone. If you're more worried about your gut and possible acne than you're excited and eager, then maybe T isn't for you. Or maybe not yet. Only you can decide that, of course. But whatever you wind up doing, you're doing the right thing by asking questions.