You just have to make sure they keep working. When I start a new generation I always make sure to put my peeps through 2 or 3 work cycles and also praise them while they work. You want them to know that working is an action you want them to do. Then hopefully you can let them be and they will work on their own. If after some time has gone by and they don't seem to make any progress I will watch them for awhile and make sure to pick them up and put them by their work area. I don't let them leave the area until they have completed at least one work cycle. That's what works for me. There maybe others out there that have different ideas as to what you can do. I do have to say that you may not always get every peep to master their profession but you should be able to get at least some of them to master it.