Best Practices for changing ANTMINER/ASIC frequencies?

[space_cat]

I've got a few old Antminer S7's that I made some water cooling blocks for and I wanted to test overclocking and changing the voltage. I don't want to do anything stupid so I wanted to ask you guys about what the best practices are for tuning frequency and voltage. I know the S7's aren't profitable and what not, but this is more for proof of concept for other ASICs. Are there any pitfalls or common mistakes people make? Can I just choose any frequency in increments and then observe chip temperatures? Any advice?

[OgNasty]

Yes, increments and watch not only temperatures but errors as well.