Getting Some Tree Work Done?

Get multiple bids with detailed estimates of the costs and time required.
Ask whether the work will be planned and supervised by an arborist who is certified by the International Society of Arboriculture.
What equipment will be used? If you are told that a crane or boom lift is necessary, ask why the work can’t be done by tree workers climbing with ropes.
How will they clean up your property at the completion of the removal or pruning?
Exercise some due diligence. If you spot a tree worker in a boom lift (see photo above) wielding an unsecured chainsaw without any protective gear at all (hardhat, safety glasses, earplugs, gloves), you’ve hired the wrong company. If workers seem to you to be insufficiently careful around the chipper, you’ve hired the wrong company. Ask them to stop work immediately and insist on speaking with a manager.
Note that some tree services are investing in electric equipment and committing to practices that are better for the environment. If you can afford to pay a little extra for that service, you will be encouraging other companies to do the same.
Here’s an earlier post on this website about selecting a tree service company.
Hiring a Lawn Service?
Does the company offer a clean and quiet service using battery-powered and manual equipment? Does it have expertise in organic lawn and plant care?
What is the minimum number of times each month that you absolutely need this service? Do you need it year-round, e.g., even in winter?
Can the work be scheduled at a time when it is least likely that the noise will disturb your neighbors, e.g., not on a weekend and not early in the morning or late in the afternoon?
Do the workers seem professional and well-trained? Do they wear protective gear? Are they paid a living wage?
Hiring Someone to Spray for Mosquitoes?
Before you sign up, do your homework. Are you breeding mosquitoes by leaving standing water on your property? Can you adequately protect yourself by applying repellent or screening a porch? What chemical will the company use, and what can you find out about that chemical by doing your own research? Are you vulnerable enough to the inconvenience of a mosquito bite or the remote chance of contracting a mosquito-borne disease that it outweighs the environmental damage caused by the spraying, e.g., the killing of bees?
Here’s a Consumer Reports article on whether to spray your yard for mosquitoes and ticks. And once again, as with anyone visiting your property to do work, insist on professionalism and adequate safety measures: if the young person misting your yard is wearing no protective equipment at all, for example, ask why.