There have been a ton of threads on UBI courses in the various forums over the years. Generally, the consensus seems to be the more you know going in, the more you get out of it. You don't want to use the time trying to get a decent bead when you could be learning about design/alignment/fixturing/etc.
Since you want to do the most difficult joining along with the most difficult to work with material, I'd say you should know how to tig weld fairly well before you go.