re: How to leave LEO
"There isn't any experience in transfering a large amount of fuel from one spacecraft to another, in weightlessness!"
"First gas station in space: The first refueling in orbit was from an unmanned Progress tanker to the Salyut 6 space station in 1978. Cosmonauts Georgi Grechko and Yuri Romanenko were in the station."
http://www.spacetoday.org/History/ManInSpaceFirsts/CreatureComforts.html
