Re: keel guard vs keel shield
No experience with the Keelshield, but I did install a Keelgaurd successfully. Key for me was taking my time.
First, I measured and marked the center line, (My boat has a rather round keel) then marked the outer edges plus about 3/32" (Because that's as close to perfect as I know I can place the gaurd. Then I lined theseouter edges with masking tape. I used a vibratory sander to scuff the surface, then wiped down twice with acetone. This prep process took me about 2 hours.
Then I took lunch, because I was hungry, and to force myself to slow down, and review the entire prosess. The application took about 30 minutes. I used the spatula thingy provided, the followed up with a heavy rubber mallet.
Really not a big deal, if I can do it, I'm sure you can too.