A lot... but in all seriousness, definitely programming languages. It's not all bad, but it definitely takes me awhile to wrap my head around even the basic rules. I can copy/paste stuff and change it around to get it to work the way I want most of the time, but if I were to stare at a blank project, I wouldn't know where to begin. I think this mostly comes from the fact that I think with my right side. I'm pretty creative, so it takes me awhile to kick my left side in order to grasp technical things.

I had a girlfriend like that. She was not very computer savvy (I had to hide the IE icon so she would stop clicking on it (it was in IE6's day when when IE's security was more swiss cheesy)). In one month of teaching, she could do pretty well. Asked for the CS teacher (she was an art student) if she could participate in the programming contest from Waterloo University. She beat all the 2nd year students save one.

It's often how it's taught and it's awfully hard to get a good starting point, too much choice.

So what are you looking forward to build? Maybe I can give you a few pointers.