Write to PIP and ask for a claim form:
Personal Independence Payment New Claims
Post Handling Site B
Once you have filled that in I would advise you to ask a friend or family member with help on the phone if you need an assessment. Put your claim in soon so you avoid the inevitable when F2F assessments come back, you never know.
Hi. I applied for PIP online. I had to ring initially and they then sent me a link to apply online. You can save what you write and return another time to continue with the form. You can also upload all supporting evidence at the time of submitting your form. When I submitted the form I immediately got the text to say they had received it. So it's quicker than posting and waiting for DWP to scan onto their system. But apart from that not sure the wait will be any less.