op 2 no 1 f minor
I don't recommend it as a first sonata. The first three movement are actually quite manageable, but the 4th movement (Prestissimo) is very challenging. Actually, it took me longer than the 1st movement of Op. 2 No. 3 in C major and the latter sonata obviously cannot be considered a good one to start with. This may come from my personal opinion, but besides keeping your hands fully relaxed (which is basically the only difficulty in the 1st movement of Op. 79), in order to manage Op. 2/1 mvt 4 you would have a hard time with all these descending and ascending arpeggios (sometimes in awkward positions), stretches, some nasty trills, coordination and evenness and a lot more. It has to be a furious movement after all. To show and convey this fury clearly you would have to work for months.
Incidentally, Op. 2 No. 1 was my first Beethoven sonata, but now I regret it was. Not that it is not a very nice piece to play, it is of course. But apart from technical struggle to learn it I also encountered many structural problems (I mean you have to comprehend texture, phrasing, articulation etc. to learn the sonata well). I strongly feel that after a preparation with a lighter sonata, like one of Op. 49 or Op. 79, these structural problems will become much easier to overcome and focusing on technique development will be more efficient.
Take Op. 79, this will probably be a challenge but on a reasonable level.