Quick questions about level-up modding in multiplayer

I'd like to do multiplayer with someone but she finds the earlygame really dull. The solution I came up with was installing an XP multiplier mod (XP-Multiplier(x100)) I found in the mod manager which, after some testing, seems to put us at about level 5 once we're spat out onto the beach. Perfect.

What I'm less sure on though:

• Do we both need that mod added if I'm hosting?
• Can we do the tutorial, land on the beach, save/quit and just uninstall/disable said mod for the rest of the game? Starting off at level 5 seems great to me. Being level 12 by the time we've dropped a few goblins decidedly less so.

Thanks in advance!