How difficult is it to change out the wallpaper in a TT?

I was pointed to this topic by another member...thanks...

We're in the process of repairing our bedroom interior:

Our interior repair

Pretty much decided to go with Luan plywood on top of our foam insulation.

Anyone here tried the hardboard from Lowes? Maybe hardboard over the Luan?

Or is 'paint' the only viable option for me--being a 'weekend-warrior'...