Best bet is to just do all HFP quests that aren't collection based. Once you're done with those, you should have sufficient gear to easily finish HF Ramps. The biggest thing is make sure all your guys are wearing mostly mail, and the most important - all 5 have a shield!

Getting the last boss down will be easy as well with 5 shamans but ONLY if you use the "cheat" method (check the wiki or every other ramps post out for the info on that). I first solo'd it at 61.5 after doing all HFP quests. I think I had something like +200 spell damage and around 4500 armor (I can't remember exactly).