Glasgow head to the RDS determined to repeat their 23-19 success of September 17, which ended Leinster's 26-game unbeaten run in Dublin.
Henry replaced Chris Cusiter in the second half of Glasgow's hard-fought win in Italy against Treviso a fortnight back and then retained the jersey for the 24-3 victory over Connacht.
Henry told the Evening Times: "It was fantastic to get the nod over Connacht. It was a massive one for us and very much a must-win affair.
"We maybe haven't been playing as well as we could have in recent weeks, so to get a fairly clear-cut win and score a couple of tries into the bargain has given us a real boost ahead of the trip to the RDS.
"I am hoping I have done enough over the last two games to stay in, but this is all about winning as a team. The result is all that matters on Saturday."
Although Leinster will face Ulster in an all-Irish Heineken Cup final on Saturday week at Twickenham, Henry says the reigning European champions will not lose focus for Glasgow's visit.
He said: "For one thing, they lost their Pro12 play-off final with Munster last season and I think that will make sure they don't suffer any lack of focus at the RDS this weekend.
"They have the chance to claim a Pro12 and Heineken Cup double and cement their status as Europe's top team and that will provide massive motivation.
"On top of that, we have already beaten them on their patch in the Pro12, when we ended a long unbeaten run for them at home, so that is something they will want to sort."