No Nothing else is required - i personally tried it on 2 sites that had been penalized

The reasons for the penaliaztions will already be listed in the webmaster's account , doesn't need $400 or a ''Seo expert'' to fix in most cases

btw in 3 months its most likely google will recheck the site by iteself and reinsert it if the errors had been corrected -

Anyway maybe you would like to share some of your techniques - let's see what Mr.Happy - ( REAL Seo Expert ) has to say about it