I'm assuming you are only changing the front.
First open the master cylinder and remove the brake fluid. I used a turkey baster.
Unscrew the banjo bolt at the calipers and put the end of the hose in a tin can. Then uncrew the bolt at the master cylinder. A little fluid may drip out so have a rag handy. You can then unscrew the splitter at the forks and remove the stock lines.
You can change the lines with the brake fluid still in the MC but it will drip a little.

If you decide to leave the fluid in the MC, then unscrew the top banjo bolt first and then the bottom bolt.
Once you have the SS line hooked up, fill the master cylinder. Hook up a short piece of clear tubing to the fitting on the caliper and place the other end in a tin can. Pump the brake a couple of times and hold it in (it should be real easy). Open the fitting on the caliper and close. Repeat until the brake lever feels firm. Leave it alone for an hour or so and try the lever again to see if it's firm.
Somtime some small bubbles get into the MC plunger mechanizm. Look down into the MC and slowly pull in the brake lever. If you see bubbles coming out then repeat until none can be seen.
Good luck
Doc