Hey there,

Well I ran it at level 60 with only 4 shamans, so this tactic should work.

Get keys to heal. Bind those keys per guy, on all 3 guys. Example: At any moment you should be able to make A, heal C, or AB heal C, or all 3, etc.

Then pick a sham to be your tank. Have him take the brunt and just span heal with 1 guy, while other 3 DPS. If needed, have the a second guy heal.

It is really easy IMO. But as you start to reach higher levels you will soon realize why the 1xpally 4xshaman team shines. Having a prot pally to tank makes things sooo much easier!