P.M.
I personally find the concept of "training" a baby to sleep a bit of a disconnect. It seems to me all we can really do is control the variables enough to make babies comfortable and relaxed enough to sleep when they are tired. Alternately, we can leave them feeling discouraged about the possibility of getting the connection and comforting they may need, dropping them into a baby version of depression. Too early insistence on a child sleeping through the night (if that was your goal) can backfire emotionally as your son develops further. Some babies can sleep alone early, but some can not achieve that until a year, or even older.
Two months is still a very long time away, in baby years. That's another third of his life so far. That's huge, developmentally. Your son is still basically helpless, barely able to move around, or manipulate things, or communicate, on his own. As his physical skills and verbal understanding improve, he'll feel less helpless and dependent on you to meet all his needs, and more participatory. That can make a huge difference in a baby's perception of things, and how much frustration they can tolerate without undue misery.
But he'll still not be able to nap unless he feels secure and comfortable (and in need of sleep!). My grandson was great about falling asleep on a shoulder, but would wake easily when we laid him down. I found that if I leaned over the crib and lowered him very slowly while shifting his weight around subtly and rhythmically in my arms, it gave the mattress a chance to warm up, and it gave his little body a chance to settle into a more prone position with less support from my arms. Then he usually stayed asleep.
I hope you find something that works for you and your son!