Long hyphenated surname – what to do when I begin publishing? I have a hyphenated surname, namely Kinara-Williams. I intend to be published in the future when I graduate and during/after my PhD.

But Kinara-Williams seems like a mouthful to cite. After reading other threads, it appears pseudonyms are frowned upon in the scientific/academic community; so what do people usually do?
Just go with the preferred one?
As other have commented, the length of your hyphenated surname is not problematic at all: keep it and don't worry.

Fun fact. Uh, well, it took me years to discover that Lennard-Jones was actually just one person and not two, and that the Hanbury-Brown-Twiss experiment was devised by two people and not three, Hanbury Brown (no hyphen) and Twiss. For  Jaynes-Cummings, instead, I tought they were two and they were actually two - amazing! But I would count this as a minor inconvenience, which actually taught me not to make assumptions on surnames (and, as suggested by E.P., this popular page discusses other false assumptions).