Never force it on him. It will give him a bad experience. But yeah hand feeding is a good start
Before my cham climbed onto me I used to take the chance when I scratched on the door etc. because he wanted me to open them. I would guide him onto my hand and place him in his free range. He thought it was a bit scary in the beginning but now he comes freely. A key with him is to not stare at him if hes unsure. We humans are the predators and they are the pray. He even climbs onto my friend now but only if his head are turned away from him while he takes the first steps
Bonding takes time. My cham wouldn't come freely until I had him for 3 months