Measure the actual opening
Record clearance below the desktop, width between legs and usable legroom depth. Include drawers, crossbars and any added tray. Overall desk height does not describe this opening. Measure space behind the desk for pulling the chair out and standing up. In a corner, check the backrest's turning space. A model that fits when tucked away may strike a wall whenever you try to leave, creating a daily inconvenience that cannot be seen in a product photograph taken in an open studio.
Try the adjustments you need
Sit down and adjust the height so that you can approach the desk without raising your shoulders. Check that your feet can rest stably and that the seat edge does not press behind your knees. Seat depth and back support should allow a comfortable position for you. More levers do not automatically mean a better fit. Ask what each mechanism does and whether it can be operated easily while seated, without awkward reaching. An adjustment that is too difficult to use is unlikely to help regularly.
Examine arms and base
Armrests can prevent you approaching the desktop or putting the chair away. Check their minimum height and whether adjustment solves the problem without losing useful support. Examine the base diameter, not just seat width. Castors need to suit the floor and intended use; ask the manufacturer whether alternatives or compatible floor protection are needed. Do not put a rug that bunches under the base down as a quick response to sliding. That can make movement more awkward and introduce another obstruction around your feet.
Rehearse a normal task
Arrange keyboard, screen and notebook as you would at home. A brief shop trial cannot reveal everything, but it can rule out obvious incompatibilities. For a shared desk, check that adjustments accommodate both people and are easy to repeat. Review assembly, permitted load, replacement parts and return conditions before buying. Persistent discomfort is not guaranteed to disappear with a new chair; workstation arrangement matters too, and individual assessment may be appropriate. Treat the purchase as one part of a workable setup rather than a promised cure.
