The hardest part for me i'm still going through. Master and i were in a vanilla (with BDSM sex) relationship for six years. i found that i needed to be submissive. It's really hard for me to give Master the control over everything when we have shared it for so long. i automatically want to help make the decision or do something my way, when His way is law. i don't even realize sometimes that He does things differently than me until i do it wrong. It's hard for me to give him the control even though i deeply want to. He is learning how to take it though. Also, i'm having problems keeping motivated to do what he asks. Sometimes i feel he's not noticing what i'm doing so i stop, and then He thinks i don't care which makes Him not care.
And the biggest issue i am having right now is accepting that His idea of TPE and mine are quite different, and that even though it was my idea, He has needs that need to be met for Him to be my Master.