I booked my first visit online (BIAB) and I was explained they do not do it on extensions. They asked me if acrylic is OK instead. Nails are nice, they still look great after 3 weeks and it was super quick (25 minutes and I was done).
As previously mentioned in reviews, it would be nice to get cuticles cut. A little concern - no desinfection during the process and the nail file was just taken out of a drawer, it didn’t look very sterile.