I still remember using an ASCII table to convert characters of a password to hex-codes in order to get my 3COM USB WiFI adapter to connect.
And in order to get the USB adapter to work I had to install a new operating system (Windows 98SE).
Networking was difficult. I remember having to install TCP/IP and doing magical voodoo with specialised printer cables to get two computers to share files with each other.
Bluetooth is like plate spinning. If you can do it, it's impressive.