Giving a firm, solid handshake isn't difficult exactly, but ask anyone who meets job candidates or just talks to new people with any regularity, and you'll hear some awkward handshake horror stories. This video from ZipRecruiter outlines some of the worst offenders, and a simple way to get it right.
Of course, the fun part of the video here are the offenders. Who hasn't shaken hands with the "Princess" and wondered what that was about, or run into some variation of the "Creep" where there's some strange finger action going on when you shake hands? I would argue most people at least try to go in for a normal, firm, simple handshake, but it's one thing if someone's palms are a little clammy or they just flub it up in a harmless manner than something more purposefully strange like some of the above.
In any event, if you do have a history of awkward handshakes, or find yourself prone to anxiety when meeting new people, let science be your guide, or this piece on how to always pick the perfect handshake.
The Perfect Interview Handshake [ZipRecruiter (Facebook)]