Classmates in the change room

I took on a programming project, but I slightly miscalculated my strength, and this work is too difficult for me for now. I don’t really want to give up on the task and let the person down.

I think that there will be no problems, but if I were you, I'd still explain this hitch to the customers, so that later there would be no questions, much less complaints.

I don't think anyone should know about this. At a minimum, this will discourage customers from working with you in the future, although in fact, situations when someone does not have time to do something and delegates tasks are quite common. Start with this resource https://assigncode.com/. On the website you can immediately check the cost of services, and in addition see the full range of work provided.