Doing it by feel is dangerous for armchair mechanics.

Buy a torque wrench and do it right if you don't have a lot of experience wrenching. A torque wrench costs way less than fixing a stripped spark plug hole.

__________________
Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual