The main thing to remember about tiling a pool is the prep. The sides and curves will need to be as smooth as a new cars painted panels are, very time consuming and costly, The client needs to be made aware of this and simply removing the old tiles and patching up the walls will not be an acceptable finish.
Here's some pics of a glass mosaic pool done in 10x10mm glass while not my work it is almost Identical to 1 of two I did back quite a while ago the
tile manufactuer was the same the prep is the same and the proceedure followed was also the same.
The pool after removing the old tiles was bead blasted to remove any loose spots and expose any weak areas then the entire surface was trowelled with a mixture of crushed marble dust,portland
cement, and a small amout of very finely graded dry sand all were the consistency of talcum powder. Then once I was happy with the filling process and the mix had cured for 14 days the whole lot was sanded with 200 grit paper first and moving down to 800grit for the final wet sand. This left the surface as smooth as glass.
The cost when I did my 2 pools back in the 90's was about $550au/m2 in todays money I would quote about $900-1000 au/m2
materials and labour (not including the
tile )so a 300m2 pool would be about $300,000 to tiles in something like the pictures a little les if it were a plainer design. You'll earn every penny.
Next the whole pool was waterproofed in laticrete black (Forget the number)3
coats then the pool was filled and left running for a month. On return the pool was drained and dried. A final inspection of the surface before the
tile fixing would commence.