I recently bought a 16 ft Starcraft with a 78 85 hp Johnson and will be using it at a shallow sandy area. I think I will need to raise engine frequently especially as summer kicks in and water lowers. What's the best way to install a power trim? I was thinking Ebay but should I be wary of a used motor? Are they easy to install? I am a novice at best but am willing to learn. I love this forum.