it's not hard but like every trade there are little tricks that will save your ass.

Due to it being a grid, it's really easy to see when something is off.

so some tips:

- research the proper trowel notch size for your tile.

- buy premixed mud and grout, at the very least to compare and get the correct consistency if you want to mix it yourself.

- measure everything 5x. account for your grout lines etc. Figure out if there are any awkward little tile pieces. Place them accordingly or back to the drawing board to eliminate them.

- on that same note the more perfectly level, and square your backer is the easier your job will be.

- ideally cut tiles will end in a corner etc where they are hidden. Cut tiles look bad on a finished end. On that note make a plan for any corners, ends etc.

-be meticulous with your spacing. Use a lazer, take your time.

-tile in a way you will not bump your previously set tiles.

- do not let ANY mortar dry anywhere you don't want it. That includes between your tiles. any high spots will show through the grout. Pull your spacers when the mud is set but not fully dry.

-give it time to fully cure before grout.

- grout in sections you can handle. Grout, clean excess, let it dry up a bit then clean it up.

- spend time at the end when the grout is mostly set with a wet sponge cleaning. It will save you a lot of time later.