tomato pollination?

hi eveyone,this is my first year of toms in the greenhouse  and they are doing ok.but i;m a little unsure about the pollination.there is one truss on each plant with flowers opening and a second truss with the flowers there but not open.i have six plants 2 sungold 2 shirley 2 ailsa craig.i want to keep the door closed as much as possible(blight)so not many insects. there is a auto vent on the roof.do you hand pollinate from one set of flowers to another from the same plant?(variety).or can you pollinate from any variety?  one chap told me he just tickled the flowers with his fingers.!any advice would be gratefully recieved.

thanks DD.the blood pressure has now stabalized.