Welcome to CHR first off! Sounds about right... These are the basic steps (skipping some but the MAJOR steps are here) that I use when doing a restoration... Strip to bare metal, epoxy primer the whole car, throw down whatever bondo/metal glaze you need, long block it with 80/180 and then 220 or so. Prime with K36 and then guide coat and do final blocking and bondo. Prime one more time, when it's dry, wet sand with 320 and then 600 (I do it twice because the 320 or 400 cuts down quicker and then go back over with 600 to smooth it out). After that your pretty much done. Try not to put TOO many coats of bondo and primer on the car. Go back over your car one more time VERY carefully for any scratches or marks and wetsand with 600 again. If you go through then right before the painter paints you can throw a sealer over the mark and just paint over it. DPX90 (if I remember correctly) is an epoxy but I use it as a sealer in case of a small bare metal spot and dont have to wait for it to dry and sand. It is a yellow primer and mixes 1:1 ratio and I reduce it just a tad to lay out. Put it on and wait around 30 minutes depending on booth temp and then paint right over it. The painter should know about this. I am not sure if anyone here uses this method but I do and I learned this from an old timer and never had a problem with it.
Another example is when I do an all over job over top a previous paint job like on a newer car, just to be safe I throw a sealer with this yellow primer over top and paint right over it. Again, I've never had a problem with this method.
SprayTech on these forums might chip in here soon, he has a LOT of knowledge on painting and has taught me a ton of things and I still use his methods.