Don't assume the worst
Most parents dread the bedroom move! But little ones are often fine with it. When a child is young his parents are his biggest constants and often as long as we are around then environment changes don't throw them nearly as much as we expect. I always advise parents to be prepared to offer their child extra reassurance and support but not to automatically assume it will be needed. For example, if you usually put your little one down awake and they fall asleep happily without you in the room then the starting point is to do the same in the new room.
If your little one lets you know he's not sure about his new environment then you can sit next to his cot offering reassuring words, touch and presence to let him know that he is safe. The following night try to scale back on the touch and possibly move a little closer towards the door. Within a few nights you'll be outside the room and your little one will be back to happily settling himself off to sleep.
On the other hand if you have been feeding or rocking your little one to sleep before putting him down into his bed already asleep, it's logical that the change will be more noticeable for him as he will at some point wake up in a strange bed! It's always worth considering whether baby's existing sleep space can be relocated to his own room - this minimises the number of changes happening in one go.
The other option (which will yield better results long-term) is to work on your child's sleep skills before you relocate them so they are happy, content and and confident being placed down awake - ultimately that will avoid your little one being surprised when they find themselves in a new bed and save you multiple trips to their room to resettle them.
Start with bedtime
I often hear of parents putting their little one down for naps in their new room for a week or two making the nighttime move. This period of "getting used to" the new room makes a lot of logical sense but napping is typically harder for little ones than night sleep. Whenever I start a sleep plan with a family we always start with bedtime as, whilst it won't always feel like it, it's actually the easiest time for a child to fall asleep. Naps are harder as a little one is working against their body-clock and environmental factors such as it being much lighter. For this reason I would make the move to the new room and bedtime and follow it up for naps the next day rather than leading with naps.
Invest in a video monitor
You don't have to buy the most fancy version (and actually there's usually a bargain to be had secondhand) but video monitors can be incredibly useful. Babies move around a lot but they don't always need us to intervene. Some make a level of noise when transitioning through sleep cycles. If you only have the benefit of sound on your monitor it's very tempting to go in to check on your baby visually - it's a normal parenting instinct! But often it can disturb a little one who was simply re-positioning. With a video monitor you have "eyes on" and can see whether your child needs you to go in and help in some way or whether they are just getting comfortable and settling back down to sleep.
A space for sleeping
I'm often asked about whether a little one should be put into their cot during awake time to play and thereby learn to associate the space with fun. It's not something I personally recommend. Whilst of course we want a little one to feel happy and safe in their sleep space we also want them to associate it with sleeping!
Safety first (and last!)
Even though the incidence of SIDS declines sharply after 6 months, parents should continue to follow the safe-sleep guidelines. I won't rehearse them here as most parents know what they are but for a refresh the Lullaby Trust website is a great resource.