Getting accurate cuts for trim

[WetSaw]

Don't forget the thickness of tile and adhesive on the reveal. The face tile normally wants to be at least the height of the reveal, slightly higher gives you a bit of room to play with if the window allows.

 

[Diggy]

Scribe the L shape cut , angle grind into the corner of that L shape , snap out the 2 pieces. That should do you without spending money on a wet cutter.

Diggy

 

[Old Mod]

Scribe the L shape cut , angle grind into the corner of that L shape , snap out the 2 pieces. That should do you without spending money on a wet cutter.

Diggy

He has a wet cutter Digs, no slide cutter. Just trouble using the fence.

 

[Fourcircles]

I would, shouldn't be any need to spend more on a slide cutter.
If the fence won't fit on the side of the tile you want to keep, put it on the side of the off cut. And if you're removing 20mm for example, practice more by cutting 10mm off at a time till you're comfortable with it. Just don't force it thro.
Those small machines have very limited power and are inherently slow.
Plus the blades are not always the best. You can improve the efficiency by changing the blade.
Will depend on your blade size and bore as to what you can replace it with.

Thanks for the suggestions! Im doing what I always do - putting it off! I am fortunate enough to be able to lend a manual cutter, so hopefully I'll have some more success with that.

Cheers