Blinker lights come with a standard box of Christmas lights, so you don’t need to pay extra for them unless you’ve misplaced the ones from the original box. You can buy replacement Christmas blinker lights for about $8 per box. If you want to plan for future holidays, you can buy a value box of 24 replacement blinker bulbs for about $12. Also called flasher lights, the replacement bulbs often come in packages of six bulbs.

Aside from a professional light installation company, there are a few other pros who may be able to help you hang Christmas lights. Along with specialty holiday decorators, a handyperson near you can also hang Christmas lights (and can fix that pesky drippy sink while they’re at it). Either way, not all of these pros will offer the service, so be sure to call ahead and get multiple quotes before you hire.

When it comes to bang for your buck, LED lights are the clear winner for Christmas lights. While these will cost more upfront, they’ll last you for many holidays to come—far longer than your basic halogen bulbs. Along with that, they also save you big on energy costs throughout the season.

Ensure you have a safe environment for them to work on, and there aren’t items such as logs, build-up of yard materials, missing or damaged shingles, and weak areas on the roof. Communicate any known electrical issues with contractors at the beginning of the project, and consider hiring an electrician to fix those. Finally, if you are attempting the project yourself, do so when there isn’t any rain, and you can safely get your footing on the roof using proper equipment, such as an extension ladder. Don’t attempt this alone, and have a helper nearby to assist.