had a search but could not find much so asking questions now

I'm thinking of replacing the wire rope rigging myself and was interested in the size of the wire rope.
Side stays?
Forestay?
I noticed that swaging tools are on sale so I'm thinking that buying a swaging tool, stainless steel wire rope, thimbles and swages so I might save me some money making my own rigging against taking the current rigging to a marine rigger...who might be at least 2 hrs or 3.5hrs drive ( 4hrs - 7hrs return). Although, I've not researched who or where I can get wire rope lengths to suit my 563 made.
Kincrome have a 350mm swaging tool on sale for $49.95 and a 600mm one for $79.95
The crimping sizes are:
350mm swaging tool ($49.95)
1.58mm, 1/16"
2.00mm, 5/64"
2.38-2.50mm, 3/32"
2.78mm, 7/64"
3.00-3.17mm, 1/8"
3.50mm, 9/64"
and then the 600mm tool ($79.95) includes the previous sizes and continues to:
3.96-4.00mm, 5/32"
4.76-5.00mm, 3/16"
Thoughts on...Can I go 1 or 2 sizes larger in wire rope in my standing rigging as a safety precaution?
Cheers, Pete