Turning that thought process off during a game can be difficult.
"In-season is very tough to make major changes for a goalie," Nilsson said. "Ask any goalie when he has a good game, 'How did you feel and what did you think?' Usually you don't think anything; you just go out and play and see the puck. But when you make adjustments to your game, obviously, you have to think a little before it sets in."
New Canucks goaltending coach Ian Clark made changes to Nilsson's post play and stance, narrowing his feet to improve mobility and adjusting his chest angle and glove position to facilitate better puck tracking and to maintain more active hands that could react more seamlessly to the play.
Nilsson struggled to incorporate the changes at first. He trusts the changes will make him better in the long run, but he found himself thinking about them. He played two games in the preseason and finished with an .821 save percentage.
"There was a lot of thinking out there, a lot more thinking than there should be," Nilsson said after the first game of the season.
It takes time for something new to become instinctual. With Jacob Markstrom starting the first three games of the regular season, Nilsson got his chance and won three straight games after more practice repetitions with Clark.
Markstrom, who is making similar changes in his stance, took advantage of the extra practice time while Nilsson started four straight games to keep working with Clark on making all the new elements instinctual. After going 11 days between games, Markstrom returned to win his past two starts, making the save on 63 of 66 shots.
"It takes some time to be comfortable," Markstrom said. "In practice, you should work on new things every day. When you are comfortable, it is going to come in a game, but you can't force it into a game. You have to work on your new stuff in practice, and in games you just have to go out and play, and when you are comfortable with it in practice, it is going to come to the game automatically, it's going to transfer over."