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I just did mine a few months back, should be easier on a warm day. Im assuming this is a three piece rubrail with the flexible rubber L-shaped liner, rigid vinyl frame, and rubber insert?

Start at the bow with the middle of the rubber and vinyl frame. Going to need at least two people and a hair dryer or heat gun. Drill your pilot holes use your adhesive/sealant of choice (3M 4200 or silicone) and use your fasteners (screws or pop rivets) to attach the rubber L and frame. Use the heat to help with the bends around the bow.

Once you are securely fastened around the turn, drill two holes at the stern in the hard vinyl frame piece and use a ratchet strap to pull the fram piece tight along the gunnel. Get it tight and line everything up, this will allow you to drill pilot holes every six inches or so, insert your adhesive, and fasten all along the gunnel without having to hold the frame as you go. Makes it super easy.

Let your adhesive cure, use something to cut the vinyl flush with the gunnel at the stern (I used a hacksaw, not pretty but it gets the job done).

Stick your rubber insert in the sun for a bit to heat it and soften it up a bit, or let it sit in a hot car trunk. If you are running bow light wires through your rub rail get that all set. You can cut a small piece of the rubber insert and make sure it passes over all your rivets/screws. Start wherever you like and push the buttom edge into the vinyl frame and use your fingers or a wooden dowel (I used a wooden spoon and my fingers) to push the top of the insert under the top part of the frame.

Its frustrating as hell, but take your time and you will get the hang of it. The vinyl frame is the worst part. Dont get it too hot or put too much pressure on it or you will end up warping it slightly. I did that in one spot (used my knee to hold it in place)

Good luck!