Actually, there was no particular challenge, this was just another forum community I joined, as I have done many times before on other online forums. Also there was no pressure at all; I just wanted to find a platform where I could learn more about the cryptocurrency and maybe reach out to like minded people.
If I had to choose, my greatest challenge at Bitcointalk, would probably be the huge amount of knowledge and experience some members have on the subject. This gives them great power in the discussion, but at the same time limits your understanding of the subject. In the end I guess that everything is relative, as you have the right to be ignorant of almost any subject if you do want to.
As to how I made my first post: I wrote a generic introduction in Beginners & Help and tried to get user feedback in the comments. That way I was able to get a clear idea of the general interest about the newbies who joined the community. As I was enjoying the Bitcointalk community, I continued to post here and there, providing various small ideas and general feedbacks to the people.