hi cyssie, i've tried this position since baby was born. so i dont't think your baby's too young to try. that said, it does take good positioning of the baby so that everything's at the right angle for latching on. you may want to get somebody to help you with that.
i tried googling for some pics of how positioning should be like and here are the results: breastfeeding lying down pictures - Google Search
that said, baby also needs to learn how to latch on properly, so it may take a few tries for it to be successful.
all the best!