The Access to Justice Foundation provides some great advice about court processes and procedures, and on what Litignts in Persons are eligible for in terms of costs.
This handy book is great to skim through and consider all the relevant points. It is 170 pages in length, but worth a read if you are considering doing it alone.
The Law Society has provided guidance to lawyers who deal with Litigants in Person, and whilst it is aimed at the legal profession, there is some good information which can be gleaned from it for the non-lawyer.
If you would like assistance, but not to instruct a lawyer, it may be worth considering the support of a McKenzie Friend.
Families Need Fathers is a Government recognised charity helping fathers with family breakdowns and resolution. They have some good information about going through court unrepresented.
Rights of Women offer a wide range of advice which includes information about court procedures without instructing a lawyer.