Becareful it is usually used by experienced contractors and sets up very fast to allow grouting to be done within 2-3 hrs and traffic in 6.
Depending on the layout you have chosen be wary of mixing too much mortar at a time.
I had a modified offset pattern with 3 different sizes of tiles, with random mosaic tiles. The speedset worked well to do portions of the kitchen that I wanted to get tiled & grouted quickly so I could move the heavt appliances back into place so I would not have to them out of place/commission for too long (fridge/freezer) and as I did not want to have to move them totally out of the kitchen/dining area while I completed the floor.
Good Luck. This was my first tiling project, 250 sq feet and was hard on my knees, but it was well worth it. My husband still cannot beleieve that I did it. Plus I saved a ton in labor costs!!!
Email me at email@example.com if I can help further.