well, im not sure which method you are currently using, but i like using a plastic fondant smoother. they're pretty inexpensive. it also helps to not have too much buttercream under neath the fondant. too much BC will make it look lumpy and bulgy. its a fine line, and you sorta have to just try it and see what works. i like having my fondant about 1/4 inch think. i just eyeball it. i know that some people roll it thinner, to 1/8 inch. hope this helps!
I recently learned from my cake instructor the buttercream underneath your fondant has to be smooth any bumps or imperfections would only be more noticeable on the fondant. Not too thin fondant would help too.
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