What is your largest chain Ring and rear cog ? How long are chain stays?
Watch the video thoroughly and try the easy no Rd method with your existing old chain to see how it works out, just in case a regular chain will be ok.
I'd have to look at the KMC 9 spd chains I have in box to see how many links they have, but usually have to take off at least 2 links. Even with a 50- 32 combo I've never had a problem with a regular chain.