Nanci's suggestion of rolling/walking the bike first is a really good one.

However, I completely disagree with this:
You can always add to/firm up the ramp logs if you feel it's necessary, too. Those things kind of disintegrate over time.
getting out soapbox...

I am a member of the NEVER MODIFY THE TRAIL school of thought. If you aren't ready to try something, don't, just walk it and try it when you are ready for a challenge. It's a disservice to those who put time and energy into building and maintaining trails to change something because it doesn't suit your personal ability level. It's also an insult to those who have worked on a particular skill on a trail only to show up one day and someone has dumbed it down ( yes, that is the term)

There are plenty of ways to practice skills and build up your ability without changing the trail: skills camps, setting up skills courses in parking lots, etc.

/soapbox