I learned to shave with my father's old straight razors when I was in High School, and continued through the service for four years (until I got out and stopped shaving for quite a while).
My dad taught me to really let the (brushed) soap do its job and soften the whiskers; use your free hand to pull the skin tight; keep the blade angle low (below 20 degrees I'd say if I guessed) to avoid "chatter," and though it may be tempting to use a bit of lateral angle on the blade for comforts sake, don't do that because if the blade catches on a bump it will glide sideways and slice into your skin.
Once my skin became healthier from using a straight razor, the blade would deform and pass right over skin imperfections (yes, the edge is that thin).
I no longer take the time for shaving with a straight razor, but was recently thinking of reaquiring the habit. I would have to invest in an new razor though, because I ONCE broke the cardinal rule of straigh razor shaving: NEVER put it away wet!
Unfortunately I ruined my father's old Excellsior, but it resides now as a keepsake with my youngest son (30).
Good luck. It's not dangerous if you pay attention. Worst cut I ever got was across the bridge of my nose while transferring from one side of my face to the other during a shave. I've done worse with so-called "safety" razors.