I'm sorry that you're struggling with your submission. Trust me that it is entirely natural for every relationship to have growing pains. D/s relationships are no exceptions to this, especially if you are transitioning from one role to another.

The best thing for every relationship is open, honest communication. It seems that things (from your description) aren't that way. You and FixIt need to find a way to communicate without it becoming a personal attack.

There are few things that you need to bear in mind:

Consider your relevant prior knowledge. Remember, you are both new to this and there are legitimate challenges you can expect to encounter when you first try to learn a new way of interacting intimately. Perhaps the two of you need mentors--even the best Dom/mes can learn from someone with more experience. Encourage him to seek out someone he can trust to talk to about what is happening between you two.

Communicate goals for your relationship. You can’t go from zero to 60 (or vanillia to slavery) in one step. Talk about what the two of you mean by terms you two are using. What do you mean by ‘Master,’ ‘Dom,’ ‘sub,’ or ‘slave?’ What do you want those words to mean in the context of the relationship you two are building (acknowledge the fact that you each have lives outside the roles, as well).

Create a safe space for conversation. During my relationships, I’ve made sure to set up a check-in every two weeks where the collar came off and we talked as equals about any issues. We would also go over her journal and anything that I noted she was struggling with, we would discuss. She could also bring up her challenges. We kept the schedule of check-ins no matter what and, IMHO, our relationship was stronger because we carved out a space to talk.

Finally, watch the language you use in discussions. The way things are said in the heat of the moment may be leading to the other one shutting down and not listening. Acknowledge the reality of what you both perceive. Comments that minimize challenges, can give the impression that something is wrong with the one who is finding things difficult. They may feel that it will be held against them if they ask for help.

ShyGreenEyedGrl has an excellent suggestion that has worked very well for me, no matter which role I've been in. Respectfully writing down your side will give you a chance to order your thoughts and reduce the perceived combativeness. Stepping away from the high emotions and having to verbalize your needs will benefit you both. If FixIt writes back, you need to show the same respect and truly 'hear' his side as well.

Good luck and best wishes as you move forward.