That's gotta be a record - over 5,800 posts and no .357 mag revolver.
Seriously, I started reloading soon after getting my first centerfire gun and have never looked back. Take your time, be careful, verify the powder levels before you seat the bullets and you will be fine. Trailboss would offer an extra measure of safety but I don't believe you will be able to get
real .357 mag performance with it.