Yeah, just jump in and practice. I have sewing skills, but lack time. I actually taped (with packing tape) a hem on a skirt a while back and kept wearing it that way for over a year. Eventually my husband washed it (he must have overlooked the fragile mending job), the tape came off, and I had to actually hem it with a needle and thread.
The only issue I've had w/ fixing hems is that I have to remember to frequently pull on the fabric to keep the thread loose. Otherwise the hem puckers. But you really can't mess it up (unless you're mending with hot glue). The worst thing that will happen is you'll decide to take out your stitching and try again.
I've fixed expensive hiking boots with Freesole/McNett epoxy shoe repair; I have also used hot glue, tape, rubber bands, sharpees and many other things to repair clothes, shoes and bags. You can do it!
