head porting & polishing

[Selfish]

hi everyone. I'm about to tackle the task of replacing the head gasket on my 91, 318i, because I really miss driving it. I was wondering if anybody has done any head polishing and porting (or any other task that I should do while I'm at it, for that matter) and if so, is it a complicated process? I've seen some guys do it on youtube and it doesn't look hard at all. In fact, I'm more concerned about messing up when putting everything together after replacing the head gasket. I was going to have someone more experienced help me out, but the guy is always too busy for me, like he was going to do it for free....so I said f** it, I'll do it myself. All input or comments welcome.