Playing a guitar definitely needs a lot of patience. It can take a long time to get used to it and learn even just part of a song. I fumbled all the time when I first began and I still do when trying to learn something new.

Just learning this song, it took me months to get to a point where I didn't fumble it.

As for the pick, just try and keep a good hold of it and maybe try some different ones, in case the one you're using is just too difficult for you to keep a comfortable grip on.