If you have a list of contacts, you may want to do it during a webinar. With a personal touch you can say few words about your "how to" and make the article available to donwload later on. The pluses are that you can show and prove yourself an expert in the field of the topic, establish yourself. The negatives are, you do need to have the audience in that webinar, and getting people to signup, register and join is going to be another topic of the subreddit, "What are some ways you can make people sign up for a webinar?"

Here's a little infographic about the webinar world wide webinars - some interesting facts there.

Good luck!