The 28 year-old prop, who completed a contract extension this week, came through the full 80 minutes against Leicester at the weekend after six weeks on the sidelines.
Talking ahead of the Anglo-Irish clash Vickery said: "I've been working hard behind the scenes since the injury in November and I was pleased to have come through Sunday's game, even though we were all disappointed with the result.
"But to come through 80 minutes against a side like Leicester is a big boost. I was really pleased and it's given me a big confidence lift for Friday's game."
Vickery started both of Gloucester's opening two Heineken Cup games away at Stade Francais and at home against Ulster.
Gloucester won 55-13 against Ulster at Kingsholm at the end of October, but Vickery and his team mates are well aware that Friday's game will be a different challenge entirely.
"Ulster's home record speaks for itself. They're a very different side at Ravenhill to what they are on the road.
"We've gone about our business quietly this week, and we'll go there with confidence and hit them with everything we've got."
The Cornish-born front row man has come up against Irish packs on many occasions and knows that Ulster will be no different.
"Games are always won or lost up front. Ulster are a good side and a lot of people talk about David Humphreys and the role he plays, but they've got a good pack of forwards.
"With their kicking game they get good field position and then apply the pressure, and are a difficult side to breakdown. They work hard for each other, there's a good ethos there and with their crowd behind them, we know what's in store.
"They'll be confident and rightly so, as they're at home. But we're also confident in our ability, and we wouldn't be going there if we didn't think we could win."
Vickery and the rest of the Gloucester set-up have knuckled down after Sunday's defeat against Leicester and made the most of a short week ahead of the Ulster game.
"We've taken the good bits from Sunday, and put the bad bits right. We'll be going to Ulster full of confidence. We know we've got to win to stand a chance of going into next week's game with everything to play for."
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