When I brought my guys home I had a room prepared for them - tree, food , water, litter box, feliway... I live on my own and don't have any other animals so the "only" issue was to calm them and getting them used to me. Also, downstairs my house is pretty much open space and that would have been too much for them to begin with.
After two days, with me at home most of the time, they seemed curious enough to se more so we went downstairs. They explored, played a little, then went to sleep on one of the armchairs they love so much now. I went to the kitchen to prepare dinner and when I came back they were sat underneath the table in the corner of the living room, not looking too brave. I realised it was probably too early, despite their initial confidence, so we went back upstairs for another day and they were ok.
On the following morning I left the room door open and we started exploring the place again. This time they were fine but I still confined them to their room for two more nights (or three, can't remember) for their comfort. So I guess taking it easy and adjusting as you go is a good way to make them feel comfortable with their new environment _in time_.
On the other hand.. their cuddliness also can vary so I wouldnt be automatically alarmed. My girl Lily is always happy to approach me and have a scratch, although forget picking her up or having her in my lap - she's too busy for that
. The boy, Noha, on the other hand, likes to play with me and comes running to the door along with his sister when I come back from work but he's not at all the cuddly type, in fact even retreating slightly from my reach at some occasions like a boy who doesnt want to be cuddled by his (grand)mother.. "Hey, I'm a man... don't treat me like a little kid.."
. Just stick to your kitty´s conditions and don't push anything and you'll be fine