On easel photometers are an excellent tool, but not an absolute requirement.

You can print 11X14s directly without going totally broke, but the next step gets really expensive and awkward. When you go big, start small. Make a good 8X10, and determine the right contrast settings and the dodge/burn routine. If you are going to process the 16X20 or larger in a drum, use a drum and the same solutions to process the 8X10 so that all parameters are as close to the same as possible. If you have an on easel photometer, measure the light in some key area. Raise the enlarger head to the height required for the final print. If you used a photometer, read the same key area again and adjust the f/ stop to give the same exposure, if possible. Otherwise adjust the exposure as needed, making a test strip if necessary. Choose a key area of the print and make another 8X10. Adjust exposure and contrast as needed until an 8X10 of the key section is right. Then make the full sized enlargement, with the dodging and burning you established for your good 8X10 (adjusted for any change in exposure time). As noted above, reciprocity takes its toll, and you often do have to adjust time and contrast for the larger size.