Bathroom Remodeling Question.?

My husband and I would like to demolish our only bathroom and replace everything, do you think we can do a majority of it in a couple of weekends? My husband has little faith or is it just plain lazy. I Wanna tear down ugly wall tile and replace with half drywall and half new wall tile, put in a smaller whirlpool tub and replace wall tile around tub, rip up the tile floor and replace with some ceramic. Eventually, get a new toilet and vanity and cabinet. HGTV has me pumped up! I think we can do it without hiring contractors.