What you need is to learn how to do rocket jump pad launches, and then switch to the BFG so that you can get that little bit of extra air.
Okay, in all seriousness... There's not really any tutorials about it. A few things you'll want to learn though:
* If you swoop at someone, and they don't move, it usually means they're up to something. Because of this, don't release the swoop button in timing with the hit, unless you confirm a hit.
* If you don't know how, learn to chain swoop. If you do know how, practice at it.
* Never trust anyone named ESFn00b, they're usually just jerks who try to fool you with their name.
* Don't become a beam spammer -- learn how to use all of your abilities, especially melee.
* It's not a rule, but it is good etiquette to not attack people during ascension.
And finally...
* Don't ever give out your Steam username or password, and never trust anyone who asks for them.
Good luck in your struggles!