I also highly recommend Benefits and Work OP. They have a rather lengthy, very detailed booklet on exactly how to complete these forms. It is excellent, and been successful for me many times. Also, the wording and phrases you use are extremely important, such as safely, repeatedly, reliably etc.
It is more than possible to go from 2 points to 12. After being disabled and on DLA/PIP for some years, I was reassessed during lockdown. As usual, I sent my copious medical evidence, which usually completes my claim without a medical. However, on this occasion they insisted on a telephone assessment, which considering I'm autistic didn't go brilliantly. They ignored my written evidence, and gave me zero points.
I did get my PIP rewarded at MR, but I'm still baffled how I got zero points to start with. I'm bed bound, doubly incontinent, and can't even sit upright for more than 15 minutes without vomiting. Their initial denial would have done the greatest fiction writer proud!!
You obviously have difficulties, and if you weren't allowed to have PIP just because you work, it would be against the rules to start with. Please fight for every penny. The way this country is going, it may be the last chance you get.
Best of luck. 💐