"Yeah go ahead" over the phone feels like an agreement. It's not much of one when a dispute starts.
A lot of jobs start with a verbal "yeah, go ahead" - over the phone, in a doorway, in a WhatsApp voice note. It feels like an agreement, and mostly it is one. The trouble comes on the rare occasion a customer later disputes the price, the scope, or whether they agreed to it at all, and there's genuinely nothing written down to point to.
Why this rarely goes well without a record
Memory of a casual conversation is not a strong position in a dispute, however honest both sides are being. What settles it quickly is a record - a quote the customer actively reviewed and accepted, with a timestamp attached.
Making "yes" easy and provable
A secure link the customer can open, review properly and accept in their own time - with the acceptance timestamped and recorded - turns a vague verbal agreement into something concrete, without adding friction to how customers actually want to say yes. Digital quote acceptance exists for exactly this: making it easy to agree, and provable that they did.
The verdict
"Yeah go ahead" is a perfectly good way to start a job. It's a much better one with a timestamp attached.