I just did in 5 mins without any pbs (so far
I first used the v104 => 105 patch,
then 105 => 107 patch and all's fine!
Just a few files to overwrite, really takes only a few min's
(on cable that is...) and everything looks just the same except,
version info in admin now says 107
look in the various upgrade forums for these patches, don't remeber where I got them, but I could mail them to you..