Hi Welcome to the forum 
Alot of people dont like the neroli. I would get the unscented if you dont like it but wear a cover scent that diffuses well. This is one of the reasons they chose neroli. Remember the unscented smells well… not pretty 
but its not hard to cover. I have them in neroli and I still cover them without a problem but its really personal preferance. If you really hate neroli go with another scent package or unscented.
No they dont mess with the chemicals in your head at least not in a bad way and there safe to use. I am not good at explaining the technical stuff but certain scents even when not obvious will trigger certain transmitters in the brain. It wont alter them. I am trying to think of a good example…
Its sort of like, Gramma’s apple pie. It warm and yummy and you love eating it. Everytime you smell a apple pie simular to hers you get that warm content feeling even years later. The only difference with that analogy is that these scents are naturally programmed into us. As far as the chemicals used with mones to duplicate this process its no different that inhaling your perfume.
Start with Instant sexiness and shine or IO as you were intending to. They are good starter products and Instant sexiness will probably become your base mone. I know it is for alot of the ladies.
This should help a little. Womens Pheromone Guide
If you have any questions just let us know and be sure to post in the ladies section. Steveo should be around soon to let you know when to expect your GC.
Tisha