several points from the last few posts.
Yes - you need to set up both LPA's before you become infirm, you don't have to register at that time, your attorneys can register for you BUT ( a big but) if there are any problems at that time it gets complicated. Much better to draw up the application and get it registered asap.
The online application is very straight forward, there are some questions that you may find difficult to answer (eg, what to do about life saving treatment) BUT, even if you get a solicitor to draw up the forms he will still need you to answer those questions.
In defense of the solicitor charges, it does take several hours to print off the forms (something in the order of 15 pages for each LPA and then thoroughly check them. However it is not a difficult task, well within the capabilities of the average person. So spend a few hours yourself and go spend the £1000 on something more exciting(Ladies, that does not include shoes)
I would also mention the help line, they are very helpful and patient.