Welcome to the Nexus

Yeah aya shouldnt smell bad, maybe a bit woody or peculiar but not overly strong/bad as an extraction with solvents could for example.  But dont add any acid to your ayahuasca, though, otherwise it could smell strong/bad (like if you added vinegar for example).

What dosage are you considering? How are you brewing? Also, planning on using any dmt-containing admixture?

I suggest for first try, go for caapi-only, maybe around 40g, and see how that goes.  The ideal is to find the dosage where you feel caapi by itself (some tracers, funny headspace, some alteration to body feelings and balance, etc) but not so much that you get very dizzy and very hard time walking etc.  Then once that sweetspot is found, add some of the admixture next time.  I preffer Psychotria viridis as admixture (maybe 50g depending on quality) rather than mimosa, but mimosa should work too (go very low, like 3g max for first time you add it), as well as extracted dmt can be added to the brew.

Good luck!