Just keep riding. It takes a while to become one with the bike.

Look where you want to go is the best advice in this thread. If you can do that you'll avoid a lot of crashes. It takes practice to not look at the thing that we're about to run into because that's our natural instinct. But we also instinctively go where we are looking, hence the problem. I learned it from off-road motorcycling. I can't even count the number of times I'd see a rock and go "don't hit the rock... don't hit the rock.. thud!". But plenty of people learn it on the bike. It even helps your driving.

You can practice descents. Climb a hill part way, then turn around and go back down (remembering to check for traffic both ways first even if it's a low traffic road). Then do it again. Start out turning around where the descent is easy to build confidence. Then work your way up the hill.