Deputyship process HELP

Hi all. 

We are trying to establish what is involved in the deputyship process for our son. 

We are aware of 2 forms, but unaware what else forms part of the process. 
We have been advised to speak to a solicitor, who has initially said that it will cost between £6.8-8.5K. 

It is very difficult to obtain this information, which does look quite complex. 

All we need is for someone to point us in the right direction. 

Any advice very greatly received.