I booked a business trip to MNL. A couple weeks later, it was decided that I would also jump over to Cebu for a day for work as well. So, these two reservations were booked separately, but the return flights we "aligned." I didn't know at the time that MNL Terminal 1 and MNL Terminals 2 or 3 are almost like different airports.

Here's the connection I need to make:

PAL 836: CEB to MNL (5:00AM / 6:15AM) - Terminal 2 (I presume)
DL 172: MNL to NRT (8:05AM / 1:05PM) - Terminal 1 (I presume)

I've been told that transferring from T3 to T1 is likened to leaving one airport and going to another, and that transferring from T2 to T1 can be accomplished from within the airport, but the walk is around 45 minutes and I'll be "all sweaty by the time [I] get there." There is allegedly a shuttle, or I can hire a car or take a taxi.

As I understand it, I have 1:20 (minus 30 due to checked luggage) to deplane, collect a checked bag (too big for carry-on), board a shuttle, check a bag with Delta, pay a tax to leave the country, and go through security at T1.

Is the walk that bad? Would it be better to shuttle or taxi? Why are these "terminals" of the same airport so incompatible with one another? (That last one was rhetorical.)

Thanks in advance.