I did it like a military operation with a newborn, and now, looking back, some of it does look a bit OCD, but it meant that I was relaxed and confident about definitely being safe.
Baby in sleepsuit. Cot sheet under baby, folding round their far side, and then up and over the top of them coming towards me. I lay on the spare fold of cot sheet (that baby ain't going anywhere), facing baby, with baby at boob height, my lower arm curled over their head, my knees curled up almost touching their feet.
Double duvet mostly scrunched around my back, and coming tightly over my shoulder and down between my knees. That duvet ain't going Anywhere Near the baby.
When I wanted to turn over in the night, I reversed the whole arrangement, and quickly got good at doing it without waking! Duvet on the OTHER side, pull baby on to warm bit I was just sleeping in, flip 'em over, sheet under me, latch 'em on again, duvet between my knees, hear birdsong because it is morning already
At first, OH was relegated to another bed, but once baby was rolling and pretty strong, that was no longer an issue (you think you can roll on and suffocate an 8-month-old (say) without the 8-month old struggling or kneeing you in the ribs? Yeah, good luck with that...) and the whole palaver with the separate bedding and the duvet between knees gradually faded between 6 months and a year, I think. Can't really remember.
Child in own bed - gradual process, just like Tink'sMum. Child gradually put to bed in own bed, and visits to parental bed less and less frequent as child needing comfort in the night less and less. I don't think I can easily answer the "when did your child stop sleeping in your bed?" question. For a family with an open bed policy, the answer will depend on whether you take the question as meaning "when did you stop putting child to sleep in the family bed every night?" or "when did your child stop coming in for dozy morning snuggles?" or "when did child stop coming in for reassurance after a nightmare?" or "when did child stop bringing their christmas stocking into your bed to open it?" yk?