Wet-saw cuts

Two questions:
First, is there a significant difference in the quality of cuts between wet-saw blades? I have borrowed a 10" saw, but it seems to chip excessively. Is it the blade or is that just how it is?

Next, how do I cut round holes in porcelain tiles to fit over shower fixtures?

OK now where is that other thread on this very same topic? It's just been two days.

To cut the hole for a fixture in a shower.
1. Remove sHower head so that all that is sticking through is the pipe end
2. Tile up to the area where the pipe is
3. Hold the tile in the spot it needs to be placed and use the surrounding tiles as a guide to get your pipes position marked on to the tile to put a hole in
4. Transfer your pipe mark position to the back of the tile
5. Make a square where all drawn lines intersect on the back of the tile.
6. Make an x by conecting both corners of the square thus indicating where the pipe's position is on the back side of the tile
7. Cut through the x in the tile
8. Cut through the square in the tile
9. Use nippers to finish rounding the edges of the square off
10. Place the tile in position and adjust where nesessary.

Will the sawblade penetrate thru the surface of the tile when out-lining and crossing-out a 1" square?

Absolutely! The trick is knowing when to stop cutting through the tile though. You have to make sure you put adhesive back to fill up any material you remove on the back of the tile, don't want any voids! You can do this method if you don't have a hole saw!

OK, your actually ""overcutting"" the backside of the tile then, huh? You didn't say that!

Think DIY, Think DIY, Think DIY.