Imperial Commando

Hi Guys, I was wondering about this also. I'm about 5' 8". How much is too much trimming for the sake of mobility? I would like to be able to kneel and walk up stairs. I have been trimming little bits as I go. any guidelines on how much trimming is allowed would be helpful. This is my first suit. a TK Commander. I've worn it down to celebration V and now Otakon over the past weekend. I Hope to get some photos soon and join up.