[rt-users] Upgrade from 4.0.x to 4.2.x - Fresh install with DB upgrade ok?

[Cena, Stephen (ext. 300)]

I'm getting ready to do an upgrade from 4.0.18 to 4.2.1 here on two servers. 
When I try the upgrade in a test environment, I get a bunch of errors that fly 
by (I don't have them, sorry :( ) but the site appears to be working. My 
question is, is it safe to do a "fresh install" of 4.2.1 and then use the 'make 
upgrade-database- script against the current database, use my current 
RT_SiteConfig.pm file & spin up the site?