As you can see in that awesome vid the breakover angle between the tailgate and the ramp is the killer...
The curved ramps are great and still much cheaper than bike damage. Go ahead and splurge! you can even use your 20% off harbor freight coupon you've been saving
Find a friend to help if you can. 478lbs of bike on your chest sucks.
Find a ditch to put the back wheels in for a flat transition. I've even power braked the truck to sink the back tires in dirt/sand (but not your neighbors yard!).
Have your tie-downs all ready hooked to the truck, I like Ancra tie-downs. You are using rated tie-downs that aren't 20 years old and cut up, right??.
Wrap a soft-tie around the stake pocket and hook there, it holds the bike much more securely laterally and also helps when loading more than one bike.
Set your ramps solidly (If your broke-ass is using 2x8 wood, it needs a metal end piece for the tailgate angle and traction aid like skateboard tape)
Use 2 ramps, one for the bike and one to walk up, but a milk crate as a step works too.
Walk up the left side, so you can get to the kickstand when its loaded, if you need too.
Tie the bike down upright, not on the kickstand.
Pull it down securely. No need to fully compress the forks you gorilla!
Tie a safety knot in front of the tie-down grip with the excess strap, don't trust those spring loaded grippy thingys! The knot I use is like a half-hitch, but you don't pull the tail through, so it only takes a quick yank to undo it. I'm sure there's a name for it but I'm not a sailor... or a boy scout.
If theres still strap left, secure it so it won't fray or hit the bike in 70MPH wind.
While traveling, actually look at it occasionally! No one will tell you it fell off miles ago, or a strap is beating the crap out of your plastic.
SFTLP.