Well, you get what you pay for, so it depends on what you want.
If you want the best job possible, with a warranty, then send them out.
If you want to save money and do it yourself, and deal with the results if you mess something up, then you can go that route, too.
The nozzles don't just unscrew from the bottom of the injectors. The injectors must be totally torn down to do the job correctly.
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