43 prayer is definitely a must to make it easier, range level doesn't matter so much depending on how confident you are. If you're not so confident, the higher the range the better, I'd say 75+.
first time i did a pure i got it pre eoc i was 99 range + 97herb 52 prayer / choatics, i had 100-200 sweets 2 extreme ranging potions fury > rangers mitre zammy top / ava for 07 i would do karils bow 75-80 range 2 ranging potions 6-7 brews 150-200 sweets should have left overs to sell too just incase rest super restores 2-3k bolt racks mitre / zammy/guthix robe top for prayer glory / fury, climbing /rangers gl