Quite possibly.
If it's about limiting financial outlay, propose a compromise: that he reads a book about divorce and prepares all the paperwork himself so that for any bit where a solicitor is needed, the time is limited.
The actual steps of filing for divorce are very simple. You don't need to pay a solicitor to come up with the wording for why you want a divorce.
On what grounds is he planning to divorce you?
But agree NOTHING and do not sigh the paperwork until you have seen a solicitor.
Do you have even the first clue about divorce law? Do you know what you and your children need, financially?
I expect not.
Blunt I'm I'm afraid but you would be a FOOL not to see an expert.
How would you even begin to know what housing / financial proposal you wanted to make?
FWIW, I made my own financial proposal, but I then took it to a solicitor.
Here's a starter for you that might make you think "fuck, I'm not winging this like the amateur I am!" (and that's not a criticism!)
Did you know, that child support above the CSA (not CMS) minimum, even if it is part of your Consent Order and sealed in court, can be stopped after 12 months? With no comeback.
So what if he is actually HONEST... Says "look, I'd rather you didn't touch my pension, but how about I give 3x CSA amount every month?" and you think - I need the cash now, so - yeah. Then in one year he's too ill to work (or, you know, gets married and has another baby and has less free cash) and he says "I can't afford that much". You're fucked. And you'll think "dammit I wish I knew that could happen - I should have negotiated more of X just in case".
It's a specialist area of law. Why wouldn't you use a solicitor?