Thought I would try my hand at tiling the kitchen splashback. To get a bit of practice first, I got an offcut of 9mm ply from the garage and a box of B&Q's cheapest tiles and had a go with them. I found 2 things more difficult than expected - (1) getting the gap betweem the tile and the wall even across all tiles. I eventually started using a steel rule to check that each tile was level with the ones surrounding it - but I have never seen anyone on youtube etc. doing this, so I wonder why I am having this problem? (2) After applying the grout (and making sure to really push it into the gaps) the grout line always looks un-even and bumpy - again no-one on youtube etc. evem seems to mention this as an issue so I am wondering where I am going wrong? Any advice on how to correct these problems?