Below is DIY guid for installing glass mosaic tiles
Step 1: Buy 50 lbs of white thin-set and 9.48 litres of mortar admix, because that is the smallest quantity that you can buy it in. (This will cover 120 square feet - we are covering 24 square feet. I think we'll have a bit left over if anybody needs some!)
Step 2: Measure the amount of powder thin-set that you think you'll need by weighing it on your bathroom scale. (We opted for 10 lbs.)
Step 3: Put on your dust mask, goggles and rubber gloves, pour the toxic liquid admix into the power and stir like mad. Avoid inhaling deeply. (note: goggles provide better protection when they are over your eyes, not your hair!)
Step 4: Using a putty knife, smear the thin-set onto the wall where the first tile should go. Using a v-notched trowel, scrape the thin-set so that it creates ridges.
Step 5: Try to steady your shaking hands while you grasp one of the 12x12 tile sheets (that's 144 little tiny tiles per sheet) and place it on the designated spot. Slide it gently to get it level both horizontally and vertically. Press it down gently so that each little tile makes contact, but not too much so that the thin-set oozes between the tiles. (Thin-set between tiles is bad, because that is where your grout is supposed to go.)
Step 6: Repeat steps 4 and 5 until the surface is covered in glass mosaic tiles. Use tiny plastic spacers in attempt to keep the sheets uniformly spaced and level.
Step 7: Throw out the remaining thin-set before it hardens in your bucket. Wash off your brand new counter top and sink, removing all the stray thin-set, and wash all your trowels and tools.
Step 8: Marvel at how good it all looks while enjoying a victory beer. Worry about the next step, when you have to peel the plastic layer off the surface of the tiles without pulling the tiles off the wall (but do not attempt this for several days, when you believe that the tiles are permanently adhered to the wall). Also worry about the upcoming grouting process.