The Eagles started 2013 as early premiership favourites, but after winning just one of its opening four games finds themselves 12th on the ladder.
Schulz said the Eagles were unlucky to have lost to Carlton last Saturday night after booting 23 behinds.
While the Power currently sit second on the ladder, he said they wouldn't be fooled into underestimating what he described as a "tremendous side".
"We wouldn't be thinking of ourselves as favourites when we're playing West Coast because everyone knows how good a side they are," Schulz said.
"They're a tremendous side and they should have won on the weekend and they'll come down here firing.
"It's a massive challenge again for us."
The undefeated Power have surged to their best-ever start to an AFL season but even after comfortably accounting for Gold Coast at the weekend, Schulz said his side couldn't relax.
The win was set up by a nine-goal second term from the visitors, but they were outscored by the Suns in the second half, 4.8 to 4.3.
Port Adelaide's players gathered on Metricon Stadium after the win and Schulz said it was to point out the second-half slump.
"The whole group was feeling the same way; we knew we'd been stitched up in the last quarter and it was a sort of a bit of a somber feeling because we didn't want to finish the game that way," he said.
"It was us getting together as a group and recognizing that we still have work to do.
"We can't afford to feel settled at all, because I think if we feel settled you sort of see what happened in the last quarter on the weekend.
"That 's just not an option for us because of where we've been the last three or four years, we can't feel settled and feel comfortable about anything we're doing."
While Schulz scoffed at the favourites tag, the Power do have recent form against the Eagles.
They scored a six-point victory in the NAB Cup and, while he admitted only limited advantage could be gathered from pre-season success, Schulz said the win would boost Port's confidence.
"It's always handy to play the sides that you play early in the year in the NAB Cup as well, it just gives you a bit more of a look at it," he said.
"Having said that, NAB Cup is NAB Cup, you take what you can from it but obviously they had injuries, we had injuries, all those sorts of things and teams play different.
"It always gives you a bit of confidence, we were able to get over the line then and we'll be trying to do the same thing again this time."
Harry Thring is a reporter for AFL Media. Follow him on Twitter: @AFL_Harry.
