No not hard at all. All you need is a vacuum diagram to pin point which one way valve and or hose leak will cause the issue. I don't have a diagram but you could go to your nearest dealer and ask them to print it out for you. It is great when they get anoyed because they have to do something for free.
Some one here may have one. You could also listen for a sucking sound and pore water a little at a time on your vacuum lines and listen for a change in idle. Also with the valves you can take one off at a time and blow back and forth through it. should only go one way.