I had FIC approval some 25 years ago for a couple of years.Hardest flying work I,ve had so far in 33 years flying.Students are usually impoverished and you normally end up teaching them to fly as well as to to teach.Ground school needs to be done and is very time consuming back then I was competing with many other courses where the ground instruction was very self study oriented.I believe thats improved nowadays and all students at least come with CPL knowledge.I have much respect for those FIC instructors who do the job properly they almost certainly don,t earn nearly enough.