Relax, relax, relax...it's actually a lot easier to mess up when your stitches are too tight because you have to try so hard to knit and/or purl. Also, your stitches don't move as easily which can cause accidents, so just try to relax and enjoy. Knitting's not a contest...what's the worst that could happen? The longer you knit, the more relaxed you'll be with the needles and yarn and the more relaxed you get, the more confidence you'll have in your ability. You'll be fine...
Now....take a deep breath...and relax
