Doing a lot of work on a car before you trade or sell it to a dealer is not generally a good idea. In most cases, you won't recapture the cost of the repairs. They can do the repairs for less than you can. Not to mention, you are selling to a wholesaler who needs to sell it again to the end-user and still make a profit.
A home sale is different. The owner is selling the home to an end-user. In many cases, the buyer is using their available funds for the down payment and purchase costs, so they don't have money to spend on repairs or decorating the home. They would need to live in it "as is" for a while, which may not be as appealing as finding a refurbished home, that's up-to-date and ready to move into.
Even if the buyer were willing to get a home improvement loan after the sale, it would be a separate loan at a higher interest rate, making their payment higher than financing it all in one mortgage at the lower first mortgage rates.
The seller may experience some inconvenience going through the remodeling process, but it will, most likely, result in a higher sales price in less time. Occasionally, sellers say they'll let the buyer choose their colors, but not all people have the imagination to know what something will look like after it is finished. It's better to go ahead and get the work done before putting it on the market.
The bathrooms and kitchen are the most important rooms to update. If the finish on the cabinets is bad, have them painted. New countertops and appliances can make a world of difference. Paint, countertops, and fixtures in the bath can really enhance the feel of a home. In addition to the repairs, a major cleaning and decluttering can make a home look and feel better than the competition.
The first step is to go through the home and pack up or get rid of things you don't need or things that detract from the home like excess furniture, exercise equipment, personal artwork, etc. Now, do the same with the closets and cabinets. There will be more room by getting rid of things, and the rooms themselves will look larger.
Next, walk across the street from your house and give it a critical look. How is the drive-up appeal? Would you want to go inside to see the rest if you were a buyer? Are the trees and shrubs trimmed? Yard cleaned up? Do you have blooming flowers in the beds? Does the front door and mailbox need a new coat of paint? Do you need to power wash the outside of the home and the sidewalks and driveway? Do the windows need washing?
Buyers are visual people, and beauty is always rewarded. Restaurants know that people eat with their eyes first and go to a lot of effort to plate the food to visually appealing. The same approach works for selling a home.
Your real estate professional can make specific recommendations and assist you in finding someone to do the work. This is what they do. Trust them!