Any homeowner who is handy and willing to do many hours of work and invest enough money can insulate a home well enough to greatly lower their utility bills. They must do dozens of small things all over the house and probably a few large ones. This website can show you how to do them. You should do them yourself because for most of them, hiring someone would not be a good investment.
I am Walter Brant. I have been a handyman in D.C. and nearby Maryland for decades, mostly restoring and repairing very old houses. I have been learning about home energy conservation from what I see on houses. I have seen many places where utilities are being wasted and the homeowners are unaware of it, and I have been taking notes since before I had a computer (I used a typewriter!). I have also been studying website design for a long time.
I wrote in this website what I have learned from what I saw and read. The chapters are each on a topic of home energy conservation, and almost all of them are very long and detailed. They cover energy tips, buying materials and small appliances such as fans, and doing all types of handyman work to lower the utility bills. It shows many pictures of tools you may use to insulate a home. There are brief instructions on how to do large projects, mainly to show their size and level of skill required, so you can search for good do-it-yourself videos if you choose to do them.
I am now writing web pages on these home energy conservation topics: Watering Lawns and Gardens; Kitchens; Outdoor Lighting; Central Heating; Balancing Temperature Differences Throughout the House; Indoor Lighting, and Mobile Homes. Where I live there are no mobile homes, I am getting information from websites written by state energy offices.
If you are not afraid to make plenty of trial-and-error mistakes and not afraid to climb a ladder, you can learn to insulate a home and to use many other ways to save energy, and you will greatly lower your utility bills.