Another factor to consider is the height and features of your home. An example would be a house completely trimmed in Cement Fiber, which does chalk if you do not purchase the correct paint and apply enough of it. Some houses in Coastal Areas are already on 15+ft Stilts (off ground) and then another 20ft high at times. This requires rental equipment and careful cost estimation based on the difficulty of the overall project, The best advice that I can give is to get several estimates in your area and make a decision a couple of weeks afterwards. You will "weed out" per se the individuals that do not have the patience to finish a project that was started-as well as those who haggle you for payment (sometimes daily) before project is completed. I have heard some wild stories from a lot of Homeowners. Common sense and your intuition will make you aware of anyone that you should not hire.
Some contractors work on time and material others on a firm contract. I would never hire the former and am leary of the latter. A contractor may low-ball a bid to get the job planning to make a killing on change orders. If you say good morning to them, they charge you extra for that. If the contract is not very, very specific and extensively fleshed out or if they display their change order schedule prominently on top, show them the door.