Hi Heike. I agree with most of the other posters here. I think that because In-Home training is very “Personal” (pardon the pun), the best source is from referrals from existing in-home clients. After all, the client is inviting you into their personal space (their home), and so a referral from someone they trust will go a long way in getting your foot in the door (another pun – sorry 🙂
I hope that this helps.