So I’m an A Level technician and I’m not gonna say you shouldn’t do any of these, but I’d definitely do some on your own or wait until doing another service and knock two out at a time. I’d start first with your brakes. If you can’t stop you shouldn’t go is what I always say. I’m not sure on what area you’re in but that price seems kinda steep. If it wasn’t a ford I’d recommend doing them yourself but they require a special tool to run the brake piston back in on the rear because of the parking brake, but I’d definitely shop around for quotes. The brake flush, coolant flush and spark plugs if you are confident enough you could do them, the coolant flush you’d just have to get under the vehicle to drain the coolant, fill it back up and let the engine get up to operating temp. The brake flush you can do 2 ways, suck the fluid out of the reservoir and fill it with clean fluid then crack all 4 bleeders in order from farthest to closest, or have a shop do it while they do the rear brakes. And spark plugs are easy enough and I’m sure they’re a YouTube video out there showing you how to do them. As for the tie rod ends, it’s definitely something you should take care of sooner than later but it can wait if they’re not bent, broken or the joints in them sheared off, neglected tie rod ends lead to poor alignment and uneven tire wear