Hello, My name isXXXXX will do my best to assist you with your question

there is no trick to offer per say

It sounds like it is corroded or kind of fused between hub and rotor

As long as caliper is off, any clips that the factory put over some lug studs are cut off and thrown out, all thats left is penetrant and hitting hard

You want to use a product like PB Blaster. be sure to spray around each and every lug stud.be sure the clips are not on the studs, if not, let soak for good bit, spray some more.

Then,, you want to focus your hitting with large hammer on the FACE for the rotor meaning right between each of the lug studs. Hit over and over between different studs

At some point it will break free

Rarer but in say 1/50 we have to use a torch and heat up the area between the studs to help break free

2 steps, all there is;'

1. Support caliper to prevent the weight of the caliper from damaging the flexible brake hose as shown in figure 3.
2. Remove the retainer clips from the wheel mounting studs, then pull the rotor straight off the studs.

Well, PB Blaster is very common lube found at near all parts stores and even Walmart. Best we have found and we use often.

I realize room is tight but,, hitting theface is the clue.. You have to try and hit straight and even best you can betwwen the studs on the face