DS1 will be 2 in August and I’ve just ordered his big bed...he’s going straight into a single that’s a bit lower to the ground.
We’re moving him mainly because DS2 will need the cot bed from about the same time. He’s also shown signs of climbing (he’s tried climbing in but not out yet) but is still in a sleeping bag (which he’ll come out of when in a bed)
In theory I want to move him a good month before DS2 moves as well, to allow him to ‘forget’ about the cot
But I’m absolutely terrified to do it. He’s such a good sleeper, self settles and sleeps through which he’s only reliably been doing for about 3 months now. I’m just terrified that moving him will ruin everything and I’m not sure how I’m going to cope especially with a little one to get into a good sleep routine also 
So hit me with the good, the bad and the ugly of bed transitions! I need to know what to prepare myself for