I hired Tim to complete some small repairs in our house - some drywall, some plumbing. While on site, Tim explained that what I had wanted done with the bathtub would require a plumber - which he wasn't. So instead, he offered to complete some other work I had pointed out while we were touring the condo (i.e. repairing the front closet sliding door). I agreed, but in hindsight I shouldn't have. The work was well done (especially the drywall), but the cost was excessive given that the plumbing, which was part of the original estimate, wasn't done.
Tim was here for 4 hours, including initial tour and clean-up, and the total cost was $795 ($703 plus tax) - i.e. around $150/hour + materials. Work completed included 3 small drywall patches, two small sections of trim, purchasing and placing a fastener between two pipes under the kitchen sink, and re-screwing a press-board sliding door in the entrance-way closet, so cost of materials I think was less than $100 (I supplied the paint).
In summary: If you decide to use Tim, don't renegotiate the work to be done on the fly, without also renegotiating the price. That was I think my mistake. Be very clear and detailed about what you want done when requesting the original estimate and stick to that, don't agree to change it once Tim is already onsite.