I find it helps to just focus on prayer, make sure you're using the F3 shortcut to access your prayer book, I found that a HUGE help (the first time I used that shortcut I won), always have one finger on F3 for quick prayer changing. Just focus on switching prayers and hit the healers when you can instead of focusing on the healers. That's what I did. To get into a position where only one can hit you you can just get them to follow you and keep moving one square north, this should get them in a line. The first time I did fight caves, I ran out of brews and it ended up being a race between whether I could kill Jad faster than the healers could kill me, was pretty exciting.