If you do not have a druid AND a fire mage you will die... ALOT!
You need fire resistancy potions (fire mage) and you need Regeneration potion (druid)
Priest can help alot but thats alot of potions...
If you have both u will be fine, the ghasts and Blazes cant hurt u (Fire resist)
and The zombie pigs (if set off) Wont kill u fast enough unless u let all the pigs spawn at once (regen)
Kill fast, there are 5 waves that spawn but if u wait 2 long u will die... no matter how many potions u have.