NOT claiming any S/H expertise, but I have been using it for about a year now. Most plants take to it pretty well, but if you haven't done it before, I don't think you should expect any miracles with struggling plants. Of course, if they are on the way down, and you haven't been able to stop it, what do you have to lose by trying? But not the best way to learn the basics of the method. I think you should start with a healthy plant that you know people use S/H on successfully. A phrag is a natural to try in S/H--mine have done very well--but maybe don't try it on your new Bessae until you have worked the kinks out!
On a side note, I use those pot in a pot type S/H pots that you buy because I like the way they look, but the do it yourself types sometimes write of melting holes in their containers with a hot glue gun tip--which kinda makes sense.
Sounds like your collection is on a roll! You're working with a good vendor, it would appear!