Advice how to cut out a square hole.

[Albert]

Around the window

You will normally have cut edges on the outside of the window, you would then fit your trim inside and then have good edge to trim and
the cut to the frame. As stated by Waluigi

 

[Pritch]

Hi
Here's a pic.
Thanks

 

[Time's Ran Out]

Whose that peeping tom?

 

[Pritch]

Whose that peeping tom?

It's a stressed out plonker who wished he called in the pro's 🙁