It is fairly simple to do on line yourself. Have a raed of this and have a look at the forms and what is needed. Any problems come back and ask. https://www.gov.uk/power-of-attorney
Here are the forms from the government website: https://www.gov.uk/power-of-attorney
You can either fill them in online then print them for signatures or have them send you hard copies. They come with plenty of guidance notes so you should be ok, but you can also get free help from charities like Age UK, Alzheimer's Society or your local Carers Centre - or simply ask us. You don't legally need to employ a solicitor for this, and they would just input the info you give them.