Ask HN: Can we build our own High Frequency RFID Reader?

I am a software developer with no experience in electronics.

Access to electronics workshop won't be an issue since my uncle has business in electronics. Also, I don't mind reading and researching on RFID.

At the moment my reader should be able to read multiple tags with less than 1 meter of distance.

I would like to know what challenges one can face while building their own RFID reader.

Thanks in advance!