+1 to the hot water. Try a cold shave. I have a very stubborn and ingrown hair prone beard with sensitive skin. When I was learning to use a straight and DE I had loads of issues with stubble. Try using ice cold, or as cold as you can, water. It tends to stand that stubble up. Also I read in an old barbers manual (there is a link on here somewhere) that a splash of Bay Rum can help stand whiskers up and strip off their oil making them supposedly easier to cut. YMMV but thats what I would do. Oh ya and really pay attention to stretching your skin. Also you may want to do a beard map so you can make a better plan of attack.

Good luck and have fun !!