DLA/PIP LETTERS RECIEVED.....SO CONFUSED!!!!!!!!

I am now going to apply for pip from dla and I need help with making sure I fill the form in correctly, I have memory problems so I get confused and upset is there a link to a topic that can guide me through the form page by page as I don't have the memory concentration to sift through all the topics. Scared to death that I won't get pip especially after the telephone part of the call with the women who was very blunt and didn't care about the fact I suffer from memory issues.
I already in anticipation have a letter from my doctor and one of my consultants but all these pip stories worry me.

Thanks.

I've just started the claim form and q2a asks for the approx date of illnesses ... I don't know it's been so long... What do I do? If I guess and that differs from my old dla claims will that affect me? And does approx date mean day, month, year or can I just put a year???? Confused! Thanks

I sent my pip application in last week and today received a letter from capita saying they will be in touch to arrange a face to face consultation it also says that the consultation could be held in my home or at a centre no further than 90 mins away.
I did on my pip application on section 15 requests a home visit due to my limited mobility along side other issues with travelling... Does this mean I have to wait for the details of the appointment to arrive then ring them if it's not a home visit?
Having a medical is my worst nightmare as previously I had one and was scored 0 points and had to go to a tribunal which took 6 months to get my DLA back!
I find it maddening because surely all this info is on my records and I went above and beyond including in my application letters from my GP and CONSULTANT, CARERS LETTER, LIST OF ALL MY CONSULTANTS and Health professionals ( 7 in total )
I just can't believe this is still not enough information.!!
I can't find where my local capita centre is ... Is there a way of finding out? Cause there's no way I can travel 90 mins I can't even travel 30 mins in a car anymore.
Thanks