You should hear to Earthatic, he is genuinely trying to help. Dream incubation is not black in white, as much as many people like to point it out: yes, even scientists. One thing you have to take into account in these studies is their length. Repeating exercises of incubation can eventually lead to incorporation of that content in the dream, but it's something "do X, 5 hours later you'll see Y". Besides, there's several factors that can delay certain content to appear. Studies have showed that the "daily residue" can show up in dreams something like 3 days later, and again 1 week later, and this varies a lot.

Not to be said that it can't be done, it's more like "be ready to try it for some time, you'll get no fast results".