You do not need a solicitor. I simply bought the following books.
(a) "Family Courts Without a Lawyer : A Handbook for Litigants in Person", Lucy Reed
(b) "Children Act Private Law Proceedings : A Handbook" (3rd Edition), His Honour Judge John Mitchell
(c) "A Practical Guide to Family Law Proceedings" (5th Edition), District Judge robert Blomfield
(d) "Child Law : Essential Court Materials", His Honour Judge John Mitchell
If you can''t afford them, just simply borrow them from the library. I got all the book from either Ebay or Amazon (amazon is cheaper as u can get second hand). (a) is a really good intro but not enough depth. (b) is amazing and very detailed. (c) mostly covered by items in (b). (d) good for taking to court for easy reference.
I also bought the Red Book... too expensive but comprehensive.