You could consider a McKenzie's friend - will be much cheaper than a solicitor and they are clued up on family law, However, if you do use one, try to find one via a recommendation as there are a small number of bad ones.
I agree that if you can afford a solicitor get one. My ex partner would never have got such a good result at his fact finding without his clever barrister who used a piece of what we considered insignificant evidence to suggest his ex wife was liar and her lies were all exposed from there on. Court paperwork is complicated to prepare and time consuming and directions are sometimes not easy to understand. They are written in court speak and at the start it can be unclear what you are expected to do. Despite what I’ve read most judges don’t appear to give litigants in person any leeway or help either. He got legal help late in the case and I truly believe if he had it earlier things would have been very different.
His ex also got legal aid on the back of a non molestation order full of lies, he had never been violent towards her and there was not a shred of evidence to back up her ludicrous claims.