Depends on how easy you bruise, my bruising lasted around 3 days and wasn't that bad at all. But i have seen a friend have it done and she looked like she had been beaten up and it lasted alot longer than a few days.
I have had mine removed now, due to my body not taking to it very well, but i have no scar at all where it was.
You can feel it under the skin but no one will be able to see it, only you because you know its there.
I dont recall any bleeding what so ever when i had the implant put in, it was mainly the bruising the day after it was put in.
Although i know you are going to have it, and i don't want to put a downer on it as many people cant praise the implant enough. I piled on the weight with it, and as soon as it was taken out i noticed that the weight just seemed to all drop back off, so i know it was the cause. And i did bleed for months at a time without any stopping. But i'm not very good at all with hormone based contraception so that might be why.
And it doesn't hurt, well i heard horror stories and was sooooo scared when i went for it put in but i hardly felt a thing.