Range hood work splits into two groups. The first is cleaning and light replacement that you can do with the power off at the breaker. The second is anything that changes the duct, the roof or wall cap, the wiring, or the makeup air. The dividing line is the line between the hood you can see and the path the air takes after it leaves.
What you can do yourself
Remove the grease filter and soak it in hot water with a degreaser suitable for metal. Rinse it and let it dry fully before it goes back. Wipe the hood face, the light lens, and the outside of the housing. Replace a light bulb with one that matches the rating on the fixture label. Check that the fan and light switches respond.
What belongs to a pro
Call a licensed electrician if the fan or light wiring must be changed, if a new circuit is needed, or if the switch sits behind a wall you do not want to open. Call a licensed technician or qualified installer if the ducted run needs to be replaced, shortened, or rerouted, or if the outside cap sits high on a roof or wall where access is unsafe for you.
The makeup air question
A strong hood moves air out of the house, and the house has to replace it. Ask whether the home can supply that replacement air as it is now, and whether local code requires a makeup air device. Put this question to the installer and the local authority, since they are the people who can answer it for your house.
Make the split a written list
Write two columns on paper. Under the first, list the cleaning and bulb tasks you will do, with the day each was done. Under the second, list the wiring, duct, and cap tasks, and the professional you will ask for each. Ask every professional to confirm in writing what they will do and what they will leave for you.
Plan from the install year
Note the year the hood was installed and treat that age as a planning input. Most of your upkeep is light work and yours to do. The larger jobs are what the install record should prepare you for. For the typical service life of the range and the appliances around it, the appliances ranked by typical service life page is a useful starting point.