You'll be fine. After you remove that plastic part on the tank, you'll be able to look around and see all the mounting bolts for the plastics. It's really not bad, and after you do it, I think you'll find it much easier the next time.
And remember... to remove the small black plastic rivets, you push in on the center of it. It will pop in about 1/8" and allow you to pull the rivet out. Totally reusable.