Start from the job, not a blank page
If the fault, the vehicle and the intended work are already on the record, the estimate is mostly assembled. Starting from a blank template invites omissions.
Make it readable
Customers approve what they understand. Separate labour and parts, name the work in plain terms, and avoid line items that only make sense internally.
Handling revisions
Strip-down often changes the picture. Revise the estimate, get it approved again, and keep the earlier version on the record so the trail is clear.