2 just popped off. 2 are being stubborn.

Heat gun?

 

Heat gun helps, but usually you’ll still end up with 3M tape residue on the LR. That 3M wheel really helps to get it off though!

Just gentle pressure usually will rip the adhesive in half or you could be lucky and get it all off.

 

Budget version of the 3m wheel that worked very well for me, and is a must for removing the residue

 

If you don't care about possibly damaging the flares then a heat gun will work......BUT...

To remove the flares try the oldest trick in the book, fishing line.
First make 2 loops on the ends of the fishing line so you have somewhere to put your fingers (wear gloves this stuff will cut you)
for "leverage". Then get the line between the flare and body panel and slowly move it back and forth.
If it feels like there is too much resistance on the line, spray where the flare meets the body with some WD-40.
This method has always worked for me no matter what the vehicle.

For the adhesive it really depends on how much is left over. The 3M wheel always works great!
Acetone (like Goof-Off) will get it off and you won't need much. And even WD-40 will do the job. Just use a "bath" towel and not a shop rag/kitchen paper towel. The fibers in the towel will grab the old adhesive and not just push it around.
Good luck!

 

I just ripped mine off. Used the 3M adhesive wheel to get the tape off. Took maybe 30 min total. No paint damage from ripping them off, most of the tape stuck to the fender.