You can do most of the divorce yourself. Just a reminder (for anyone) that divorce is split into three parts: the admin part (dissolution of the marriage, think decree nisi and absolute in old terms); the financials (splitting of assets); and children. There are four ways to do this: mutual agreement; mediation; solicitor; court/judge. A judge prefers to see that mediation has been tried first except in DA situations.
The admin side is all online and is mainly a tickbox exercise and requires zero solicitor input. Only thing to remember is NOT to request the Final Order (decree absolute) until the financials have been signed off by the courts. Never, ever do this. There is a 20 week cooling off period once you apply to the courts. Use those 5 months to collect financial information.
The Children part can be done between yourselves or mediation unless one of you is abusive or just a twat who likes messing their ex around for shits and giggles (OPs ex is one). A solicitor might be needed but definitely get mediation involved first. And a court approved app for communication. These apps prevent messages from being deleted or lost so his twattery will be there, loud and proud, for a judge to see.
The Financials are best done via a solicitor unless you've both had a consultation with one to find out your rights and future needs, and are fully supportive of each other especially where children are concerned. Too many women give away their right to a share of his pension thinking it is a similar worth to theirs. Until you've had the CETVs back you won't know and most women are very surprised that men's pensions are worth more generally speaking. Even if they haven't gone part time, or taken full maternity, the gender pay gap is a very real thing and does affect pension worth. Download Form E from gov.uk as you will both have to fill one each. It's a very large form but most won't be applicable, however it does taken time. Sending off for CETVs can take months.
Sorry OP if you already knew but there could be others posting/lurking who might not. Oh, and whoever starts the divorce has control over every part including holding back on the absolute until the finances are signed off. Sometimes that control is worth the £600 fee.