Here's Amy's video
on increases; just pick one that seems to suit your needs.
And if I frogged everything I've done because I've made a mistake, I wouldn't have anything knit at all! Gee, no wonder you are frustrated!
Just take a deep breath, and accept that mistakes happen to all of us! And most of them don't have a serious effect on the finished product, and most are easily fixable on the spot (the increases/decreases Ingrid mentioned, for instance). You're learning from them--be proud of that!
I knit a pair of socks for my husband to wear to a big interview. They had a simple 3x1 rib...but in a few places, I got out of rhythm and the knits and purls got all messed up. I didn't notice until the next row. There was no way I was going to frog the thing, so there are some minor...."hand-knit features" on his socks. :D (And those are NOT the only mistakes in those socks!) He wore them and said it was like I was there with him. He loves them because I made them for him. That's all that matters to me.
Oh, and the booga? I knit one for my best friend's daughter. (It's drying as I type.) There are several mistakes on it, but I just was not going to frog. I try never to unless I absolutely have to. (Thank heavens for felting!)
You CAN do this--knitting shouldn't be stressful--don't let it be. Remember the term "hand-knit feature" and make it your friend! :D