Change can be scary. It can also be an adventure. It's all a matter of perspective.
I liken your situation (which is fairly common) to using a muscle that hasn't been used before. Take it slow. Don't try to take on too much too fast. It may be painful. But pain doesn't always mean that damage is being done. Pain can aso be a part of growth.
Make this a positive experience for him. If it makes you a happier person, then share that happiness by doing/saying those things he enjoys. Help make the change an adventure for him.
Me: 48 - Married, straight, male
Shiela: My wife.
Suzanne: My FWB
Adam: Shiela's LDR