To guard stylus or not?

I leave the guard off always, unless installing or removing a cartridge.

Right. Even a really intelligently designed stylus guard like Soundsmith uses the fact is you get that close you don't have to be all that big a spaz to do some real damage. I keep mine handy and mount it any time I think the risk of a something catching it by accident is greater than the risk of botching it with the stylus guard.

Also keep a strip of Scotch tape handy. Usually when the stylus guard goes on the next thing is to secure the arm in the arm rest with the tape.

cakids, you are the very first person I have ever heard of that uses a stylus guard between sessions. 

If you can lock the armwand then no need for stylus guard (imo)

On my Lyra, I always utilize the stylus guard between listening sessions. I am VERY pleased that the Lyra’s feature this design.
Admittedly not a good idea to remove or put on the guard if you are drunk or otherwise impaired, lol. So, like all things analog, a steady hand is a must, and carelessness does NOT get rewarded.