Vance Wood
Lord Mugo
Do not do the cut it like a pie for now. I don't care much for the soil mix. Sphagnum moss, and perlite are things I have little use for, sorry. I use Pine Bark mulch sold as composted soil conditioner, swimming pool filter sand #3 or #2 grit, some charcoal, Pumice or Turface or red volcanic gravel the small stuff. Mix it approximately in thirds by volume and there you go. It's not rocket science. But by the time you get perlite and sphagnum wet and stable the tree could be dead. You can do some basic styling. Good luck, Watch the watering the tree may not be taking up water at first you don't want to water log it. This will change rapidly so watch it closely. I don't teach the pie cuts any longer because without actually showing how this is done a lot of people have been doing this to aggressively.