I've got a damaged bridal that I posted a week or two ago, found someone who can fix it, but I can't figure out for the life of me how to detach it.

The bridal in question is the middle link between three that connect to the kite and near one of the lines where all the other middle linS-P-A-M-L-I-N-K-s are connected. (hopefully that makes sense).

It looks basically like a square knot or something to that affect. The reason I can't figure out how to untie it is the knot is made from a stitched loop, I feel like I'd almost have to cut the loop to remove it. or else possibly start from the kite and undo the bridals connected directly to the kite, and keep moving up. A problem I see with that is the farthest point away from the kite is where there are probably 8 to 10 bridals all coming together. Seems like I'd have to undo them all just to get at the one I'm trying to fix

yup, you will probably have to take it all apart, my advice is take lots of pics before you separate the lines

I feel your pain and my guess is unless you cut it, you're going to have to undo the bridle in stages to get the to leg that needs replacing. I'm hoping my sliding tip line on my gin never wears out because, by the looks of it, I'll need to undo an awful lot of bridle just to get to that one line.

My thought, if that time ever comes, is that I'm going to cut it and make up a new line like this:
--x--x----------------x--x--

where "X" = a knot and "--" = replacement line, that way I can larkshead the existing good bridle legs in between the knots. That way I only cut the damaged line and don't undo the whole bridle.

You may want to try that if the only option is undoing the whole thing.

I may get a whole lot of experience with this very thing. Pretty sure the bridle on my raptor needs replaced. Diagrams, pics, and numbering are your friends.

It will be tedious to label all the bridles with bits of tape and numbers with a diagram, but then it will go quickly and go back together quickly.

The knots look like square knots because the way the are slipped together and they are very different than a larkshead (despite being labeled as larkshead in some references). There is a subtle but important difference. See photos below.

When slipped over a webbing loop at the kite like the photo below, it will not look like a square knot, but slipped to another loop farther down in the bridle, it will look like a square knot. (and look better)

acampbell is right, the only way to do it is to label all the lines with tape, make a diagram and the take it apart. You will be supprised how easy and fast it actually goes.
If you cut the line out that needs replacing you cannot get the new one in.
If you tie in a line then you just created a few more places for the lines to get hung up in.
I changed complete bridles on kites a few times and it normally takes me about 1/2 hour for a complete bridle change.
go for it its easier than you think