West Ham boss David Moyes is wary facing Derby County in Monday night's FA Cup tie.
Moyes says West Ham is a happier place after victory over Everton.
He said, "You feel better after any win, I can tell you that.
"I've got to say it (Everton) was an important win for us and one that we were pleased to get.
"The idea is to go again, try to build momentum, try to pick up on a really good result. We've had some okay performances which didn't lead to results and I thought last week was an okay performance that did lead to a result.
"I'm looking to improve on both, I'm looking to improve on scoring more goals wherever we possibly can and building on the clean sheet too, which was really important for us.
"The FA Cup is a great opportunity, but you still have to win the games, whoever is put in front of you.
"It always sounds like [an opportunity, with Chelsea, Newcastle United, Crystal Palace, Brentford, Aston Villa and Wolverhampton Wanderers already out and Liverpool facing Brighton and Arsenal taking on Manchester City in the fourth round] until you have to go and play the opponents.
"Last year we were given an unbelievable game at Kidderminster, where we came minutes from being knocked out, so anything can happen in this competition and we've seen that over the years.
"We need to be our mettle, we need to play well. Derby are on a good run at the moment, they are a football club that is Premier League in stature and size, so we go there and will give them all the respect we can and hopefully go through to the next round. But they'll be thinking the same.
"I've been on the other side, when I was at Preston and we played Arsenal, who were the champions at that time [in January 1999].
"We were 2-0 up at one point and ended up losing 4-2 unfortunately, but it was an incredible game. We have games in this competition where [shocks] do happen.
"We have to be at our best to get through, but yes, I do think the competition could open up. You mentioned a few teams who have been knocked out already, but always it is on the draw. Everybody wants to win the cup, everyone wants to get to the final, there's no doubt about that, but the draws sometimes can go against you, or sometimes you can play badly and get knocked out."