"BobK207" writes:
Blueman-

I use a Porter Cable Saw Boss (6 / 6.5" circular saw) with a dry
diamond blade i just free hand it without an edge guide. The circular
saw blade itself helps guide to guide the cut. I never have much
trouble getting a fairly straight cut. I just cut along a grout line.

I assume by "along a grout line" you mean parallel to the grout line
-- i.e. you are cutting tile not grout

Also, would I be better off using my smaller (but cheaper and way less
powerful) ~4" cordless Ryobi circular saw or using my larger and more
powerful Port Cable 7.5" circular saw?

i.e. will I get better control with a smaller saw even if it is lower
quality (presumably)?

the dremel will work but steadiness is a problem (at least for me)
Is that true even with an edge guide attachment?