From just watching the first few seconds I THINK that this is similar to the method in the link I posted.

From the look of the YT comments it seems to work, so go for it!

If you are in a position to back everything up first, or at least take copies of relevant mdf, ndf and ldf files for the purposes of reattaching if it all goes horribly wrong, then...well, just take what precautions you can before doing anything rash is what I am saying.

Good luck, and let us know how you get on.