I just did that on my 92 300 TE. You might want to use the appropriate size flare nut wrenches also call line wrench if the fittings are real tight. Here's how I did it.

-loosen slightly but do not remove top and bottom fittings of old hose
-completely disconnect top connector first, put a rag around the top of where you disconnect it to absorb the small amount of fluid that will leak out
-unscrew the entire hose, i.e., at this point only the bottom is connected
-have your new hose ready and tight bottom first, completely tight
-tighten top fitting
-go on to the next one
-when all four are done bleed brakes by whatever method you prefer

I did not have to add any fluid to the brake resorvior during the hose replacement since the level never got below 1/2 of being full.