For a long time I've been interested in D&D and pen-and-paper style games. I'm trying to convince my… lets call them 'social contacts', for… years.
I have to add that I have a social competence disability, which makes it hard for me to establish a solid group of people around me that I can kind of call "friends". So my social habits are more like meeting new people and losing the contact after some time (unintentionally caused by myself). In fact, it is hard to find people that are at least open-minded to give a game like D&D a chance and try it. So getting a group of 5 people together is almost impossible for me.
To prepare a situation that may occur where someone would be willing to give it a try, we would be 2-3 people at most.
I myself, who never DM-ed before, would be playing a starter adventure with 1-2 other players while the set is made for 5 people. It would already be tough to play it as no one has previous experience with it. Imagine that, in addition to that, I had to crunch the numbers to adjust the adventure without having any knowledge of the balancing behind it… It appears to me like my player(s) will have a session that won't be that enjoyable for them, and I guess that after that session, (s)he/they won't want to play it again as the result of the first impression.
To prevent this scenario (in the case where I'll finally be playing D&D), my question is:
Is there an enjoyable and easy way to adjust the difficulty of the beginner adventure, to be designed for a single PC? A general method for adjusting adventures in such a way will also be helpful. And would this still provide the same gaming impression?