Newbie Here!

Hi! My name is Mandy and I was thinking of joining the online weight
watchers program but, was wondering if someone could tell me if this
program is easy enough to maintain in the long run? Also, is it safe
for pregnant women because my sister is due in October and was wanting
to do this program also with me. I'm 22 and she's 27. Also, sorry for
so many questions, is portions easy to calculate while traveling
without using measuring tools? My sister is just looking to keep
herself healthy for her baby and I am looking to lose atleast 65
pounds.

Mandy H.