Please do not deliver anything in person, including if you never make contact with anyone in the house, unless you have asked your giftee and they have explicitly said that it would be OK. You can reach out to them anonymously through the link on their preferences page when you retrieve their information at Redditgifts. They may be more comfortable meeting at a local coffee shop or somewhere more public than at their house, but if they're ok with it, it's ok with us. Just remember to mark it shipped, and you can use "by hand" as your shipping method.
It is one thing to know you have a parcel coming from a stranger on the internet, it's a whole other ball game if they show up unannounced on your doorstep. Absolutely do not hand deliver a gift without the expressed consent of your giftee. Doing so will cause you to be banned from all future exchanges.