[OOPS - my answers to your initial questions got embedded in your post. Please expand it, above, to see them...]
There's no need to be nervous. Depending on how many shows you want to see and/or characters you want to greet, I think you can do most of HS in half of a day even with a 45-60 minute lunch, and still have a couple of hours left over for JTA. Here's my advice:
1 - If you have any choice in the matter, choose a mid-afternoon JTA time (e.g., no earlier than 2pm), so you can have your morning free.
2 - Make 9am/10am/11am FP+ for: (1) your choice of RnR and TSMM; plus (2) your choice of any 2 of Tower of Terror, Star Tours, Frozen or Indy (edited to delete an incorrect reference to GMR as a Tier 2 attraction, per
@amjt660).
3 - At rope drop, head straight to JTA sign-ups (if you didn't have a breakfast ADR and couldn't be in the line already), and then head to the Tier 1 attraction for which you do NOT have a FP+, followed by Tier 2 attractions that are in the neighborhood and/or for which you don't have a FP+. If any line is more than 20 minutes in length, skip that attraction and attempt to get a 4th FP+ for it after you've used your first three.
4 - Fill in with shows as desired. Choose just one ahead of time that you all consider your "must do," and do additional ones if there is time.
As an example, my family's HS touring plan looks like this (estimated wait times are based on an estimated crowd level of "6 out of 10" by touringplans.com's reckoning, on a Saturday that has Extra Morning Magic (meaning there will already be guests in the park when we get there). We're not doing JTA so obviously that allows us to do a headliner at rope drop and not worry about coming back to do a show later, but hopefully it will give you an idea of how much you can get done in HS in just 4-5 hours of touring, if you time things right and use FP+:
Hollywood Studios - 9am - 2:15pm, on Saturday, November 19 ($EMM day)
1) 9:00am-9:30am: Rock 'n Rollercoaster. (Non-interested party members: TSMM)
.
2) 9:30am-10:00am: Tower of Terror
(with 9am FP+). (Non-interested party members: 9:30am Little Mermaid show or 9:40am Disney, Jr!)
.
3) 10:00am-10:15am: Rendezvous in Pixar Place. Toy Story Midway Mania (
with 10am FP+).
4) 10:15am -10:50am: Great Movie Ride.
[10-minute restroom/snack break]
5) 11:00am - 11:10am: Star Tours (with a [largely unnecessary]
11am FP+).
6) 11:10am-11:30am: MuppetVision3D.
[OPTIONS afterwards (will depend on group preferences at the time)]:
7A) 11:30am-1:30pm: 12pm Indiana Jones / LUNCH BREAK at PizzeRizzo, if open
7B) 11:30am-1:30pm: LUNCH BREAK / 1pm Beauty & the Beast
7C) 11:30am-1:00pm: LUNCH BREAK / 12:30pm Frozen Singalong
8) 1:00pm-1:45pm or 1:30pm-2:15pm: Star Wars Launch Bay (Non-interested party members: One Man's Dream, shopping).