You will need to learn how to read a T-square in order to be able to cut the proper angle on your diagonal wall cabinet.
The only other thing I can think of to tell you is that you can try making a template of the angle with a piece of paper and use that to mark the angle onto the molding you are going to cut.
If you try this, suggest that you practice on a piece of scrap molding first.
The only other thing I can think of to tell you is that you can try making a template of the angle with a piece of paper and use that to mark the angle onto the molding you are going to cut.
If you try this, suggest that you practice on a piece of scrap molding first.