I decided to test the optics of the little Skywatcher Heritage 100 a couple of nights ago, and looked at the Trapezium. Under city skies with the 10mm eyepiece that came with the scope, I was just about able to see the fourth star. Yet I’ve read the trapezium is easily seen in a 3″ scope. I’m going to re-visit the Trapezium with the Heritage again as soon as possible and sketch it. Although I saw it from the city Monday night, I could still see the famous nebula and distinctive ‘fish-mouth’.
There’s some excellent maps on this Sky & Telescope page.