I dunno how to get the front endlink off...the rear is easy enough.

Can you take off the lower control arm to get better access to the endlink nut/allen hole in end of bolt?

Anyway, I'm looking at the manual, I'm sure you have too, and it just says to "remove the self locking nut from the stabilzer link". Doesn't say much else, but I can see in the pic that it's recessed, just can't tell how much room there is in there to get a wrench.

I'd keep trying, and only take it in as a last resort unless you know someone there that won't rape you on the labor.