An expertly remodeled master bathroom will provide years of pleasure and comfort. But do an amateur job and you’ll be reminded of the fact every day. It’s a tricky space, unfortunately, with lots of moving parts crammed into a tight footprint, not to mention the volumes of water ready to exploit any and all leaks. Setting a budget and planning ahead are two ways to keep your project on track. (See Bathroom remodeling trends and costs.) And also take care to choose the best sink, counter top and toilet for your space.