You can do this to help, get warlock to makes cookies, buy an agil flask, buy the healing/agil Battle pots from the vendor, and get fort/might/mark/etc before heading in. Also, for that little bit of boost have a shaman/mage Timewarp or Hero/Lust right before you enter the arena (You will lose 5-10seconds of it, but still 25-30sec of hero).
Good luck.
P.S, stun/pushback/etc the gnome as much as you can.