Everton saw off the League One outfit 3-1 last night.
"It's a win and we can go into the game against Reading (on Saturday) a bit more confident now," said Coleman.
"When we got the draw for the quarter-final and it was a home tie we knew it was a good incentive, but we had to beat Oldham first which we knew wasn't going to be easy.
"We know Wigan will be hard but being in front of our home fans is always going to give us an advantage.
"We would like to get back to Wembley but every team is looking for the same thing, so we can't think too far ahead."