A few quick answers:
Wanna try shave oil?.....Use Olive oil or corn oil from the kitchen. Does the same as the expensive "shave oils" but is much cheaper. If you find you like the oil, PM me, I'll send a recipe I use.

If you want to see if the DE will cause the same bumps as the Multi-blade I suggest you not shave for as long as it takes for your skin to completely heal and then try the DE single pass, until you learn the angles. You may have to shave more often but as you learn the DE, you'll get a better shave. Also, I use DE blades from Wilkinson that cost $1.99 for ten blades. As a result, I never use one more than twice which means your never going to use a dull blade.