woodsmith
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If you are only levelling the wall to fit wall cabinets rather than tile the whole wall you could just fit packers (100x100mm ply to the thickness of the tiles under where you will fit the mounting brackets.
But back to your original question, it's normally better to remove the paint. Two things to try, first get some duct tape and stick a 300mm length to the wall, rub it on hard and leave it for half an hour. If you can pull it of without taking any paint off with it then wet a section of the wall, leave it for a few minutes and then wet again. Get a scraper, the type that fit a Stanley blade work well, and try to scrape the paint off. It quite often comes off very easily. If after this the paint is still intact you can just roughen the surface with a very coarse sandpaper before sealing the wall, use the sealant recommended on the tile adhesive, not PVA. If either of these processes lifts the paint you would need to remove all the paint before sealing and tiling.
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