Don't hire that dev. He must be full of sh... if he has trouble at this level.

I can assure you that running your own lightning node is no problem at all. If you are capable of using Nostr, you are definitely good enough. If you have never installed any Linux OS on a laptop, here is the fool proof way to run your own lightning node without Linux:

Buy Raspberry Pi4 with at least 4GB RAM and an external USB hard drive (or SSD) with 2TB disk space. Go to umbrel.com and copy their software to SD card for use in the Raspberry. There is step by step instruction for Raspberry on umbrel.com website. Once you have umbrel running on your Raspberry, use its appstore to install Bitcoin app. Wait about a week for it to sync 100%, then install lightning node app. In that app open a channel with 2 or 3 other nodes that you can find ranked at 1ml.com . Do not open more, because then Raspberry starts lagging. That is it. Any problems on the way - let me know.

If you have a wifi or wired router at home - you are good with notworks. Don't worry about technical network security or privacy. Just follow the instructions, and umbrel takes care of everything.

Don't put so much money on it that you would be upset losing. At least until you have tried erasing everything and successfully restoring from backup. Chances are low, but still, first times are first times.