My next tip is about keeping your tool clean....Oooooer Missus !
Dont use WD40 etc. If you do it will feel great at first but then it attracts dust and debris from the cut tiles. This in turn will build up inside the slot on the handle. Easy way that works for me is either use a household polish on the bar or better still I am finding at the moment is "Mer" a fancy car polish. Before using these products though make sure your cutter main bar and the slot in the handle are clean.