if you are a target and group shooter, dont be over-thinking so much about classifier... just go to the local matches, enjoy, and step by step you will be learning the basics..
tactical and emergency reloads can be practiced at home after double checking the gun is unloaded
transition can be done at home, dry fire and that will help you a lot. get some idpa targets or something smaller and practice transition, trigger control.
and practie draw and pull the trigger without disturbing the sight picture.
at end all is reduced to trigger control, transition and sight picture. speed come with the time..
18 points down at 3rd stage is very good...