The reason why many people give up on learning Excel are normally due to the following reasons:
I) They have tried improving their Excel skills before however they ended up finding the material to be so overwhelming and confusing that they just gave up.
ii) They assume that they lack the time necessary to devote to learning. Basically they had falsely assumed that they would need to devote many hours to their learning. Not true!
The trick is to study as much as you need to without getting confused due to all the material that is available and thinking (falsely) that you need to devote loads of time in order to make inroads.