I performed an egr cleaning…
I performed an egr cleaning on my toyota prius just this weekend, after I found an endless number of tutorials on the topic. Although the principals behind the procedure are simple and straight forward, I can tell you from personal experience that they are not easy. SIMPLE, but not EASY, if that makes sense. If it helps anyone, here are the best pointers I found in step-by-step form, the first one in particular is probably the best in terms of accurately illustrating all the difficulties and pitfalls.
youtube.com/watch?v=DTcBJm3N5nA
youtube.com/watch?v=2_Hr2tAK7-c
Also, the removal of the egr cooler seems to be a major source of discouragement as discussed in this forum: priuschat.com/threads/2015-prius-egr-headgasket-question.243125/#post-3394596