Access to Work Claims

I recently organised for NAS to do a workplace assessment and Access to Work agreed to fund my claim however I'm not at all clear on the following:

1) Who actually receives the invoice from NAS for the assessment, me, my employer or Access to Work;

2) Who has to fill in any forms to make a claim - me or my employer

3) Whether I have to make repeated claims each time I need help or incur a cost whether I have a single claim kept open for as long as I need it?

One of the recommendations in the NAS report was that I should have a Support Worker - on a similar basis to the above - where would the Support Worker come from, who would fund it and how would I go about putting that in place?

I've just booked on the two day work skills for employees course but when I mentioned it to Access to Work they said that the course would not be covered because they had only approved the fundng for the workplace assessment.

I just spent 30 minutes on the phone to Access to Work trying to understand what is going on and the person I spoke to didn't have a clue what the claim process was like - she'll get someone to call me back within 2 working days - which could mean anytime in the next week.

 I'm now worried that I'll have to fund the workskills course myself and also teh trvael and accomodation costs too (the course is in London and I live in the Noreth West).

Can someone give me some idea of how this thing works because, having started to feel better, I now feel like I'm just going backwards. 

I can do without "Help" like this.