Felting is a lot of fun once you get past the scary of throwing it in the washer.
Here is a couple of tips for felting:
Crochet generally shrinks more in width than in height.
A slip stitch edge does not felt well.
Put your felted item in a pillow case rubber banded shut or a lingerie bag to prevent clogging up your washing machine.
Use Hot cycle, a few drops of detergent. Throw in old jeans or something similiar to help get more agitation.
Check item for desired felting about every 5 minutes. I like to lose all stitch definition. This is up to you.
Do not run through the spin cycle. Instead roll item in a towel, to avoid hard to remove creases.
Once you start felting, it is addicting, so beware. Check back here for updates. My hook will be flying.