I don't think it's worth it. I'd do 1-2 g to start with.
I find watching TV or film on shrooms detracts from the trip. It's very unsatisfying.
Like I mentioned I would normally agree with this, but only once it is established that the shroomer is not exceptionally sensitive.
Also note that finding that out takes several trips because mushrooms are products of nature and can sometimes vary widely in potency, even within the same batch. And you don't want to accidentally be thrown in the deep end with mushrooms IMO.