I can totally understand your paranoia. I am a Part 107 drone pilot and often feel the same way with so many places labeled "No drones". To really feel free to fly and get some practice at flying at a distance I suggest you find some BLM land...
Watching this excellent video I feel that such a replacement is not a job for the uninitiated. There are so many points where serious irreversible damage can occur.
Purchased my Mavic Air in February of 2018. Flew it a good bit right off, but as with all new things, lost interest and put it away. Just recently regained interest, so charged batteries and checked to see if it would connect to the DJI Go app...
Now that we have the NDAA (mostly) off the "we need to panic" list, let's temporarily turn our focus on the issue with DJI drones and U.S. Customs and Border Protection (CBP).
The CBP is using The Uyghur Forced Labor Prevention Act (UFLPA) to...
DJI give a lot more information that that in their specifications.
Read them some time and you might understand that obstructions and interference will eat your transmission range.
Fly somewhere away from interference and with a clear...