Crib to cot question

My son is almost 3 months old. His crib is a fairly small rocking crib that sleeps next to my bed (it's quite narrow). He's a fidgety boy and is quite long bodied. He doesn't seem to like sleeping in there anymore I don't think. I know the recommended age to move a baby to a cot is between 4-6 months. When did you move your baby into a cot in their own room, and how difficult was it? 🛏🛌🛏🛌