I used Wal-Mart for quite a while until I started changing it myself in my Apt. parking lot. Got tired of the wait.
Wasn't too difficult you just need to make sure you have a 13mm box end wrench. Bolt will be in there real tight, so rather than strip the bolt get a small lightweight 1-2lb item and tap, and I mean tap gently about 50 times on the wrench and the bolt will break free with no stripping or anger!
Make sure you have plenty of wrags handy too!
Trust me I know this!
