I am sorry to tell you that, but your trainer is an asshole who does not know shit about steroid use, or any other PED's.
First of all, in any case 6 weeks would be way too few for sustanon and deca cycle. For this sort of cycles you need to run these compounds for at least 12 weeks, since these are very slow acting compounds, and in 6 weeks you just won't have the time to experience their effects.
Then for the AI's - they are not liver toxic, and they are essential when using these compounds, since excessive estrogen levels can lead to a lot of side effects. Also, I see he did not suggest you to use cabergoline, which is necessary with deca, since this steroid will increase prolactin levels....
All in all, I would give your trainer a beating for all of his advise. Next time on have all you need for PCT before even starting a cycle, because this type of situations can take place anytime.