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No you just have to get the water level below the skimmer after that you should have no trouble making repairs.
Regardless of the position of any tiles on the pool wall The water level should be about 3 or 4 inches / 75-100mm above the top of the skimmer vein before the skimmer basket or at such a level that it does not suck air through the skimmer. of you have a suction side floating pool skimmer you can let it get as high as you like and as long as it is sealed properly as low as you like.
Add thru the skimmer box
Depends on what the chlorine demand is for your pool. 1 inch tablets are not compressed as hard as 3 inch tabs and skimmer sticks. If your pool requires more chlorine you may want to use 1 inch tablets. If it has a low chlorine demand skimmer sticks may be all your need. Skimmer sticks are the hardest compressed and slower dissolving.
Google Aladdin pool equipment ( Lilly Pad skimmer)
you may have to prime your pump Clean or replace the filter.
You only use the skimmer/s
If you have a top skimmer basket the water level should be at least an inch above the basket, so you are not sucking any air. They seem to operate more effectivly at removing floating material BEFORE IT SINKS if the level is about half the distance from the top to the bottom of the skimmer opening.
Adding algae control to the pool skimmer helps to disperse the chemical and coats the filter media.
It won't work as a skimmer if your water level is above the skimmer. If you watch how the skimmer works, the water is pulled in over the skimmer door and it won't "skim" the floating debris off the surface of the water if the water level covers the entire opening, your skimmer will just suck in water that is below the surface. If you keep the water level so it's at least below the opening an inch or so, you should be o.k. If you've recently had alot of rain, you may need to drain some water out of the pool so your skimmers function properly.
You should have two valves: one for the skimmers and another for the bottom drain. Close the valve to the bottom drain. One of your skimmers should have a rotating disc which will cover the intake at the bottom of the skimmer intake hole. Rotate the disc. In this manner all the suction from the pool pump will be at the one remaining skimmer. Attach your cleaning hose to this remaining skimmer while vacuuming the pool.