The Warriors lost 19-11 in France last weekend despite bossing the territory for much of the first half, as ill-discipline - including a Leone Nakarawa sin bin - cost them dearly.
But Gregor Townsend's troops, who are perched nicely for another assault on the GUINNESS PRO12 play-offs, are still well within a shout of progressing to the next stage of Europe.
Next weekend could well be make or break and Harley is adamant the Warriors can learn their French lessons in time.
"When you look at the energy Toulouse played with, they were feeding off the crowd and that can help get you those 50/50 calls," Harley said.
"When you've got the crowd behind you, you get little boosts so hopefully we can pack the place out at Scotstoun.
"We played well in some regards but came up against a really good side who kind of taught us a lesson in controlling the penalty count, being clinical and taking the chances
"In the opening half hour I was happy with how we played the game, the areas and the pressure we put on them. At this level, against a side of that quality, when we do have our moments of pressure within their 22 we need to come away with points."
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