I used IKEA 13 years ago on a SFR in San Diego so I am sure a lot has changed.
At the time they did layouts for free. I heard they changed that but maybe they changed back.
I paid IKEA to provide a crew to assemble them. So the boxes were delivered and I just checked box counts. The assemblers were scheduled for the next day and came with a small crew and put them together real fast. Back then I did not have my current GC so I used an installation crew (not same crew as did the assembly) suggested by IKEA that did a great job.
My current handyman is slow at assembling cabinets. My current GC does not like to assemble them. So if I were using Ikea today and they still offered assembly I would pay them to assemble it. They do it repeatedly and therefore are both fast and will get it right. Also if a part is missing it is on them to take care of it.
The cabinets are holding up well. The granite counter had no lip and tenants dried their dishes on counter that dripped down cabinet front that is in front of sink so it needs some refinishing. Everything else is perfect.
We have done 4 rental kitchens since then and have not used IKEA but I would consider using them again. Two of the kitchens we did since them we used discontinued line of cabinets at great discount, 1 we used refurbished used cabinets (apparently the cabinets were not sealed and so they are wearing at the handles too fast so if you get refurbished make sure they are sealed/lacquered for rental units), 1 we refurbished the cabinets that were already in the unit. If the unit has solid wood cabinets then refurbishing in place is a viable solution.