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Because the agreement was verbal, there really is very little reason for an attorney in this case. There isn't going to be any contract language to interpret.
The only document that you'll have is the invoice for your work. If you have records of your work period and can state, with clarity, why it is that your figure of $4000 is what you should be paid, as based on the verbal agreement that you had, then you do not need an attorney.
Small claims is intentionally set up to be accessible to non-attorneys so that you can avoid the expense of having to pay one.