Good Luck. I think he will ease into is new bed with minimal distruption!!!
Well I can be a well meaning person who says.....Get that cot DOWN and OUT as soon as the bed is up!!! lol
The day Soph went into a bed we actually made a deal out of it one saturday morning and Jake, myself and soph all helped take her cot down first and said bye bye to the cot and then yay hello big bed as Jake put the new bed together and sophie helped pass the screws etc then helped me make it after it was up.
So I was the same as you and once i had decided that was it. I think it can be very confusing for them if send mixed signals so good on you for sticking to your way.
I am the same too once dummy was gone that was it. Then when trying to wean from breast - the day they took that first cup of milk no more booby and once I put them in undies that was it.
From my experience thats the best way - but you know that!!!!
Now just to get my 3rd and last baby sleeping through........I know once I decide on that I will do it but I am soft this time around as I was saying yesterday lol.
Anyway enough on me.
You have every reason to be excited sad and nervous! Its a big thing - your first bubby in a big bed! yay
Let us know how it goes!!