I have succesfully gotten TWRP on the recovery partiton but i need to know if it is safe to update twrp from twrp on this device (becasue the pie stock flashable via Twrp lists a newer version)Good job!
Yes, use the other LGUP for the rest of the root procedure. But the newer one is recommended for anything to do with Pie.
Just follow the Part 1 steps in post #2.
Post #1 mentions unplugging the USB cable to interrupt flashing H933 after laf, which the OP later confirmed you don't need to do. I could have sworn he updated this in post #1 as well. I think an older version of that post may have been restored accidentally at some point.