While climbing you may come across moves that seem impossible. However with some simple new techniques like flagging, heel hooks, and toe hooks. This may all seem overwheming at first but not all of this is needed to be able to climb. In fact all you really need to know is keep your toes not your foot on the wall and how to grab holds. If you feel the need to learn more about technique a simple google will tell you all you ever wanted to know about climbing technique.
A flag is when you stick one foot out in the opposite direction to maintain balance.
A heel hook is when you "hook" your heel around a hold to maintain balance and reach further.