good day. i have seen mentioned on threads hacks to use to reduce the hill climbing in Lisbon, i believe posted by Maribel. despite my best efforts, i have been unable to locate a comprehensive list of how to make use of these. if someone could direct me or provide the a link i would be very appreciative. we leave 9/3 and are super excited to see Portugal. thank in advance.

Go to maribelsguides.com. Find “Lisbon” in list.
Or send her a message through her website.

mel-
uber is your friend in Lisbon - make sure you have the app on your phone. We had best luck with planning a day's activities to start with a site furthest up a hill, work our way back down. Some places require an inevitable bit of walking uphill, like Castelo de Sao Jorge, as taxi/uber gets you only to the entrance gate.
Trams are OK, but can get crowded (especially the touristic #28) and pickpockets can be an issue. Metro and buses are pretty easy to use.
Agree that maribel's guides are excellent, and you can download her free city guide here.