Getting solitary kittens is going to much harder than having two.
I've got (separate litters, both rescues who came to me very young) and they are 6 months now. One is semi feral although getting much better now, so was always quite easy in that she didn't want cuddles or to be stroked, she pretty much wanted to be left to do her own thing. The other however is like Velcro cat, he is scared of the dark, he is scared of being alone, he wakes me up in the night for cuddles, I can't pee without him mewing outside the door and he climbs under the covers with me and spoons which whilst very sweet may not be everyone's cup of tea 
Having two though, has meant that when I can't pick him up and cuddle him girl kitten will step in and they bound off and play. They are lunatics, they charge up and down the stairs at break neck speed, they climb the curtains, they've fallen down toilets and got stuck under the floorboards. They disappear into the lining of the sofa and can't get back out and when they're hungry they mew and shout their heads off in a way that surpasses the whingiest toddler.
They need feeding three times a day and when smaller it was four, so I couldn't go out for the day without popping him twice to give them lots of cuddles and feed them. They have to stay inside for at least 6 months, preferably until neutered and ideally a year which means lots of crazy energy fuelled charging about and litter trays that endlessly need cleaning because they aren't pooing outside. I wouldn't recommend getting them in summer because you obv can't open the windows as they will escape and you will all roast in a boiling hot house.
Having said all that they are utterly gorgeous and I wouldn't be without them. I'd go to your local rescue though, they have a lot of kittens in kitten season that won't be advertised on their site as there are just too many and such a high turnover but don't be close minded to getting an older cat. Or maybe a youngster just past tricky kitten stage, say around a year old would be a good option?