Applying a move from wrag to support group

Hi there, couple of questions please , i talked to my work coach today and we agreed i should really be in the support group ( well apply for sure ) i should of been years ago but after being through two tribunals ( won both ) over the years i was so exhausted i just let it go like some other people ,i applied for pip too and got it first time and awarded on review by a letter for several years so it was a lot to process , well the work coach talked a lot about the process so much and so much info i lost track of it all.
She said if i want to apply she will tell dwp they then will visit me at home to fill the form in.
I have been wondering what happens next ? If they say NO do i just stay in the wrag group with no changes ?
IF I were to disagree with their NO decision i understood i would do a MR ? Then onto Tribunal if that was still a NO , but would i then have to go on assessment rate , have a face to face or provide fit notes ? Im not sure i can take on a lot of stress at present so need to know EXACTLY what im doing. I couldn't financially survive if there was a drop in my money at all as live alone and have no family to help waiting for money ! Im already waiting for sdp to be decided and paid but the new direct debits wont wait ! Many thanks x

Ok thank you Gordon, i feel like i was pushed along , the coach said the DWP will love her that day as she had reffered several people that day to them , i dont feel up to applying at he moment as have health complications at the moment and im struggling , she pushed at the end of the call and ended up saying she would phone in a month to see if i wanted to apply .