I always pre-cut all my backerboard (1/4" for floors, 1/2" for walls) before I install it.

Once it is cut, then you need to pick it back up, sweep the floor, then mix your thinset like you would for tile.

Once the thinset is ready, use a 1/4 trowel like you would with tile and spread out, then install the backerboard on top of it and screw it down on all of the X marks on the top of the backerboard. Once you have it all installed, you need to go back and put thinset over the seams, put some backerboard seam tape down in it, and then smooth thinset out over the top of it like taping a drywall joint. Let this dry for 24 hours before continuing.

At that point you are ready to lay out your tile. Measure 24" from one wall at both sides, chalk a line. Go to the wall that is perpendicular and do the same thing (this is for 11 3/4" tile). Once you have a intersection on the middle of the two chalk lines, lay out your tile going both ways and make sure you don't have a super small tile at the edges, if you do, you need to adjust your measurements.

Once you get the layout figured out, you are ready to install tile. Make sure the surface is dry and clean. Mix thinset and apply with a 1/4" notched trowel. Only apply in the spot where you are putting down tile so the thinset does not dry out to much. The first tile you want to level out with a torpedo level. Use 1/4" spacers (I prefer the ones that have a quadrant on one side and a line on the other) between tiles and just repeat the process till you are done.

Then it is just grouting which is simple, and to clean up grout haze use a little vinegar in your water, cuts the haze fast. With grout just mix, then apply at a 45 degree angle across the tiles, back and forth pushing the grout down in the cracks with a grout float.

That is pretty much it, I will take pics of the process as a can and post them up to see if it is any help to you.