I started out with mtn bike shoes with mtb cleats for my road bike.It was easier to learn to clip in and out. I now have stiffer road bike shoes, with Mtb cleats and working on getting Rb cleats. The shop guy( who is trusty) told me that it is harder to clip in and out of RB cleats.
So if you have problems( like chronic fatigue) or are not too strong, stick to MB cleats until your better.
I am still having issues on bad days so I find that the MB cleats work fine, but I am not riding further than 35 km at a time.
It is hard walking though,,in RB shoes even with MB cleats. I get plenty of stares and they seem super slippery if I go to the shops.
Conquering illness, one step at time.