first time tiler.....help:-)

You prob could...if you really wanted, however, for a small shower, you would prob be better off with using smaller tiles. I presume you've got these left over from other work?

You need to check to see if your wall substrate will support the weight of the tiles first...

Generally recommended to tank a shower enclosure before tiling or at least make sure you get a consistent complete covering of adhesive.

You'll need cement based 'bagged adhesive' due to size of tile.

You'll need a good cutter etc to deal with the size.

Set out tiles from edge of tray and work in with cut tiles in the corner to allow for them being out of plumb.

Also check that with the added thickness of tile, your enclosure will still sit on the tray properly.

Silicone corners and around tray, don't grout as it'll likely crack over time and let water through.

 

Check how 'flat' your walls are with a straight edge/level etc. obviously, the flatter the better, but will determine if you need to use a bigger notch trowel for adhesive and adjustment of 'flatness'.

 

And make sure you seal that wall with the recommended sealer for your adhesive(even though it's an anomaly being floor tiles n all)

Mr. HandyAndy - Really