New Aneros user with questions and comments

Sounds about right to me, being in virtually same spot you're in: out-of-shape muscles you barely knew you had. Experts, founders and patron saints on this Forum recommend Kegels and progressive relaxation training. You get better the more you apply yourself, I reckon.

Hi @qwerty48, welcome to Aneros Forum. You need to arm yourself with information about the Aneros and how it works:

From the Learning Center: https://community.aneros.com/learning-center/men

Study thoroughly the Aneros Wiki.

And yes, feel free to ask questions.

I can attest to the power that the Kegel Exercises have had in my life and in my Aneros sessions.

@BigGlansDC Your encyclopedic knowledge and ability to refer instantly to the large volume of texts that people have contributed over the years are a great service.

@rollingalong, thank you! I have found the collective wisdom of this site very helpful in using the Aneros effectively over the years and refer to it often.

1. ...I realize every guy's body is different but could this mean it's too small or not the right size/length/width for me? I'm average height, average weight.

It's probably not too small at all. The path toward prostate orgasms is more a psychological journey than a physical journey. The men who have successfully found a path to these orgasms have often also found they can get there with no device at all (Anerosless sessions) thus size is not a determinant of success rather your perception of the sensations your body is capable of creating is.

2. ... I wonder if a larger Aneros would be better for guys with regular-size prostates, coupled with how easy the Helix went in.

I don't think prostate size is related to which massager model is better for an individual, though larger sizes may, in fact, be painful for men with enlarged prostates as attested to by some of our members. The size you will feel most comfortable with seems to have no definitive physical determinants . In fact, it is more likely your individual mood will determine which size model will be most comfortable for you on that session occasion.

3. Today, everything feels fine except the lower edge of my abs are sore from the PC contractions. Is this something I should expect for a while?

Yes, but as you get more experienced you will find your pelvic floor muscles will get stronger, more toned and have increased stamina enabling longer and stronger orgasms, both wet and dry types.

@BigGlansDC gave you two essential reading sources to help get you started on a good path, I've also sent you an introductory PM with some additional hints and tips to further your journey.
Good Vibes to You !