I can tell you when I first got Invisalign I cried because I couldn't figure out how to get them out of my mouth. Don't let that discourage you. The trick is: first bend the trays a bit back and forth and up a down to get them a bit flexible. Don't bend or stretch too much or the tray will split.
When you put them on, your teeth will ache and be a bit sore for a day or two. It's normal. Take a Tylenol and you'll forget about it. The trick to removing them is to grasp the back left and back right with each hand then pull up and OUT to the sides of your mouth to release the tabs on the front and then pull up. If you just try to pull up, it'll never happen.
Also, sometimes just taking them off from left to right or right to left works depending on the placement of your tabs. Other than that, and the hassle of removing them every time I ate and drank, they have been amazing. I have noticed such a difference. It's been seven months and I can't WAIT to get the tabs off and show off my new beautiful teeth. I will post pictures when they are done!