Product or idea really being accepted
(hotcakes)
(Splash)

The challengue of trying to sell a product or idea.
(obstacle)

The challengue of trying to sell a product or idea.
(brick wall)

The challengue of trying to sell a product or idea.
(opposition)

The challengue of trying to sell a product or idea.
(reception)

people raising a worry
(to raise = lift into air)

(concern)

overcome/ defeat / win a challengue
(issue)