I have experience with the PF Tek method, which is very workable. You have to make sure that EVERYTHING is as sterile as you can make it. Also, the perlite humidity method (couple of inches in a sealed tank with water up to half way) is a very good way to go when the cakes are ready for birth.
Keep watching for contamination (horrible smells, green, red patches, etc.). It can be cut off if it's not too deep but it will take over eventually.
Use plenty of spores to speed up the process because you can always make spore prints when the first yield comes.