Laying Granite Tile Countertops

Hello, what kind of problems come with "pressing" granite tiles into pre-made mortar thinset?  

We followed your installation step-by-step and did great....until laying the tile last night. Using 12x12, 1/16" grount line, pre-made thinset and rounded bull nose 25" long. For the most part our thinset lines were evenlly spread. Installed small area first, that went well.  Problems came while laying large L-shape countertop. Choosing 1/16" grout lines looks pretty when its done correctly. But its a huge job keeping lines straight and level tiles in all corners. During the process we found high & low spots and ended up "pressing" alot more than recommended. I understand it may take 5-6 days to dry and thats ok. Just concerned about issues that come with pressing tiles. Overall it looks good this morning, with very few high & low spots. Your help is apprecaited!

You can buy pre-made single-slab pieces of granite for a backsplash, which are simply mortared to the wall, but a cheaper and often better-looking alternative is to cover it in a grid of cut-granite tiles.

I agree with the other comment that it is easier and manageable to use grid tilings. When you have laid the whole thing out carefully, you just need to make minor adjustments at the corner as required when dealing with an 'L' shaped countertop. No messy equipment required, just small tools like knife and scraping pen.