I'm unable to tell a kitten's age, but if Marcia's right and these little ones are about 3 months, then I wouldn't hesitate. I live alone and work full time (and, given the nature of my profession, I commonly work 60+ hours a week). I adopted Muffs when she was 11 weeks and had no problems. I put her in a safe room at first, with a litter box, cat tree, toys, food, water fountain, etc., and let her out at night when I came home. I later adopted Abby. She was also a kitten when I adopted her.
Both of my girls are long haired, and I find long-haired cats easier than short-haired cats. You do notice the shedding a bit more, but it's so easy to clean up. I just take a damp cloth and wipe it along the couch, bed, etc., and the hair comes right up. My daughter has a DSH (Neko, who is the cat in my avatar). Neko has stayed with me from time to time and I have a devil of a time removing short hairs off furniture, bedding, etc.
The only thing I would caution is to see if the kitten enjoys being groomed, or really struggles. Abby loved being brushed from Day 1 and she's a joy to groom. Muffs struggled (literally screamed!) from Day 1. I've tried every trick in the book to get her to tolerate grooming. She's better than she was but she still refuses to let me groom her belly. As a result, I have to take her to the vet for grooming from time to time, which gets expensive. That said, I fondly refer to Muffs as my neurotic cat (as much as I love her) and I doubt too many cats are as difficult with grooming as she is!