Hi!
I don't think the process has to be super complicated. I've done fairly well keeping sticks in the past, and now have more a a mixed situation, so I've done this in reverse ha. I think to really help we would need some specifics about your setup. Flow, lighting, water specifics (alk, ph, ca, mg). Water change schedule, and what salt you're using. That said, there are a few basic things that probably apply.
1) you'll want to make sure your lighting is SPS friendly. However, if you're just doing digitatas and caps your LPS lighting might be adequate.
2) make sure your alk is VERY stable. The number one killer of SPS, IMO, is alk issues.
3) if you have a lot of LPS make sure you have room for SPS. I don't know of an sps that will beat out an LPS in a turf war.
I'll leave you with this, and I think it holds more true for those who keep sps than anything else, and it keeps my brain geared the right way: Remember we are keepers of water, and the corals simply exist there. If you keep perfect water then you'll have no issues with any coral you choose.
Looking forward to those specifics!
B