I am in the middle of a similar project right now. I am also scanning my deceased fathers collection of a few thousand 35mm slides. I elected to do it myself instead of sending to a professional service for the primary reason that I felt a significant number of slides were not worth scanning and I didn't want incur the time consuming task of selecting which slides I wanted to send and then have to sort and categorize when returned. I find that I'm really only interested in savings pictures that contain images of family and friends. My dad was a fantastic photographer who always owned good gear, but, I'm really not that interested in pictures of famous places he visited on vacation. If I want to see a picture of the Eiffel tower I can find many choices on my computer in two seconds.
Your choice of scanner depends on a few factors. What type of quality do you want? How fast do you want to process them. How much image correction do you want to do while scanning. How much do you want to spend. I chose the Epson V600 scanner. It's geared toward scanning photographs in negative/slide/print format but is basically a flatbed scanner as opposed to dedicated slide or negative scanners. So far I've done mostly slides. You can do four at a time with this scanner.
I made my decision based on the review written for this scanner by one person on Amazon.com. If you search for Epson V600 on Amazon and then click on the ratings the first one when sorted by "top reviews" will be from M1K3 from D3troit. It's the most informative review I've ever read on Amazon and gives great detail on the methodology he used to scan 5,400 slide with the V600.
I have removed greater than 50% of the slides by giving them a quick review by holding it in front a light source. Scanning at higher resolution is a slow process, but, as the review said. if you get into a rhythm, naming and sorting the images created while a new batch is being scanned, it goes surprisingly quickly. I named the files with year-names of people in pic-location/description.
I'm very happy with the results. The color correction for old color shifted slides is fantastic! READ that review on Amazon and if you decide to buy it, save that review to a file for set up information in case the review is removed for some reason. Don't buy the scanner on Amazon. it's way overpriced there. I bought a refurbished unit from Adorama for $160 and it has been flawless.
Oh, and as suggested by that review, save the image files created on at least two different devices. I have mine stored on the computer disk drive and an external USB drive. My computer files are also synced with one drive to the cloud.
Although time consuming, it really is fun to review these old pics. I wish I had done this while my dad was alive so he could give the background on some of the pics or tell me who some of the people are. I've scanned about 400 from the 1956-1960 time frame and the quality of those old Kodachrome and Ektachrome slides is impressive. One positive aspect of this quarantine, it gave me the time to get started on this project. Good luck on your project!