Always introduce yourself if possible at a church event or at church, if
you have an inactive family as everyone probably does, you should write
them a letter first explaining who you are, what you want to do, and when you
want to meet (Local mail takes at the longest 2 days), also include a
brief description of the message that you want to talk to them about.
Then call and speak with them. The fact that you took the time to write
a HANDWRITTEN letter along with a phone call, is more often than not a
ticket into the home of the inactive.
A way to truly introduce yourself, is to set up a preliminary meeting between your companionship and the head of the household. Ask him/her what they expect of you as hometeachers (a message each month, availability for blessings, etc). Then you and your companion can mention what you expect of them as your home teaching family. It could include things as:
As well, this should not count as a visit, except if this is not a newly assigned family, or if the situation warrants it.
Whenever I get assigned to a new person or family to hometeach, I like to bring a half-loaf of French bread with me. I make a big deal about it being only half a loaf, to remind them that man does not live by bread alone.
I've only found a few places where that's mentioned in the scriptures, Deut. 8:3 is the start of it, then Matt. 4:4 and Luke 4:4, it's mentioned in the D&C as well. After quoting Duet. and Matt, you can challenge them to find the other references, then show them how -- if they are relatively new in the church. But any way you play it,
it's a GREAT way to start off, and a lesson that won't soon be forgotten!