St Swithin and Deena Nicol Culture Info?

[murphy48]

Hi
So I knew I was getting in over my head yet couldn't stop myself and I ended up getting a giant St Swithin and Deena Nicol and now that I have them I'm hoping someone experienced in their care can give me some guidance. I know the basic culture info but there are so many other important details to make them thrive.

Any experienced growers our there who are willing to share their tips?

I also have a question about repotting... it appears that the Deena Nicol was last repotted in July 2003 and the St. Swithin in Feb 2006. The Deena Nicol's potting media definitely looks broken down. Should I repot them both now or wait until spring?

What potting mixes have people found best for these two?

In your experience how much light do they need?

Thank you all for your amazing advice!
Kristen