Donnie,
Are you using the mug as a lathering bowl or are you wanting to make the mug a new "home" for your soap?
If you are wanting it as a lathering bowl, you need to check out Jockey's video (heck, you need to watch the video anyway:)):
http://straightrazorpalace.com/video...er-lather.html
I use Jockey's method and LOVE IT! With Jockey's method, you don't have to take the soap out of the plastic container. You build the lather in your cool marble dish. (I modify Jockey's method a little by adding some hot water to my soap dish first and let is sit while I shower - it softens the soap some. I then pour the soapy water into my lathering bowl.)
I've ordered a custom made scuttle, so for now I use one of two bowls for building my lather:
1. Check my page for one example - a nickel bowl in a coffee mug.
2. The other method is setting my $3.99 bowl from Target in a sink of hot water just below the rim. The bowl is in my picture at the bottom of page 13: http://straightrazorpalace.com/shave...y-29th-13.html. The only down side to putting the bowl in the sink is that you have to be careful to not accidentally splash water into the lathering bowl.
Be sure to follow Jimmy's advice on not getting nicks. Don't "push" the blade, let it do the work. Obie told me to treat the razor like a bird - hold it firm enough so it doesn't get away, but gentle enough so you don't hurt it. Using this advice, almost 4 weeks in I've only gotten 1 or 2 very minor nicks.
Keep us posted.
Hope this helps,
Greg