Basically it's a matter of what you have power over. You now get Enduring POA and Lasting POA. The former gives you the ability to make decisions regarding finances on behalf of another person. The Lasting POA extends your abilities, meaning that you are also able to make medical decisions on behalf of the person and gives you access to medical notes, etc in order to come to an informed decision on their behalf.
We have Enduring POA for Dad as we hope our wishes would not be ignored regarding PEG feeds and other issues, as he has end stage dementia and our views should be considered. However,we have no legal rights to stop medical intervention- other people may want this right to ensure they are in control of what happens, and for this you would require Lasting POA.
Why not download the forms and have a look. If you decide to diy
Remember that all the i's need to be dotted and t' s crossed and perhaps needs to be worded in a specific way. Also get a couple of people who are good with forms , perhaps age uk or Alz Society to advise and check them
Am sure others here who have used solicitor or diy will be along soon..
I've just seen you didn't really get many answers to your question so thought I'd reply.
I filled out the LPA forms (both financial and welfare) for my mother myself. You have to make sure you answer every question or cross out the whole page. Make sure every signature is provided. If your parent has capacity to understand what they're doing, you shouldn't have much problem. You will need a Certificate Provider to sign to say they understand (an old family friend, doctor, such as that).
We filled them out, and got them registered with no problems. If you use a solicitor the fees seem to vary quite a lot for what is really quite straightforward, provided you read it all carefully.
You have to pay to register, I think it was £250 for both of them.
Just to add that you can get the fee reduced/wavered from the OPG, it is means tested but easy to do.Solicitors charge a fortune but we paid about £250 each. When my bf and I get POA I will do them myself.