Household tip. If you've replaced any plumbing in the last 10 years, you know the score--it's junk. So today we have a plumber here. The first task is rather simple if you know to ask for it when the fixtures are installed. If you don't have children in the house who want to remove sink stoppers and flush them, or use them as missles, have the stoppers unlocked when installed. Your (definitely our) age or the special tool needed to remove them for cleaning may require a call to the plumber. Also, the products purchased at Lowe's or other consumer outlets are not the same as those the contractors buy at their supply house; much cheaper (looks the same in the box) and less likely to hold up. Still, even the so called quality items are plastic.
The big job is removing everything from the bathroom cabinet, so a relatively small adult can lie on the floor between the stool and the sink and get under there.