With regards to what they feel like, it depends on it depends on what type of implant you have, what your breasts were like before the op, how much breast tissue you have, what size implants etc. Generally, the less breast tissue to have and the bigger the implant, the more likely it will be obvious to the touch what the implant feels like. The same with feeling the edge of the implant, although the edge isn't likey to be very obvious. Generally though, implants feel a bit firmer than actual breast tissue if you have silicone.
Recovery wise, it depends a bit on where your implants are placed, under the muscle is more painful. I don't think it would be recommended to lay on your side though soon after surgery and you wouldn't be able to lay on your front.
You do need to wear a support/sports bra/dressings for quite a while after the op, but there's no reason that you can't just have a week off work and not tell anyone you have had it done. I know people who have done this.
Do I have regrets? Not really, despite the fact I have PIP implants and a probable rupture. At the least I have grade 4 capsular contracture in my left side, which seems to have been caused by recurrent mastitis while breastfeeding. It's painful and I look a bit wonky because of it, but I am still breastfeeding so can't have further corrective surgery yet. I also have silicone in my lymph nodes and this can happen even if you don't have a rupture. However, other than that I am happy with them and although I considered removal only, I think I will have these implants replaced when I finish breastfeeding.