I used to drive a 5-speed manual chevy (now the auto for a company car and my personal car).
The best place to practice for the first session would be in the big parking lot, followed by a some slight incline so that you can practice starting from the dead stop on the incline (going up, that is).
Break & clutch in, put the gear in the first, get off the break and immediately to the gas, rev up a little bit of gas as the clutch grabs the gear (like 1000 to 1500 rpm), off the clutch
For the second , third, and so on, just the repeat of the above (except for the first "break" part).
If the car does not have a tach, you have to go with the noise of the engine and feel of the car.
Once you get a hang of it, it's like right foot (gas) in, left foot (clutch) out and back and forth.
Don't ride on the clutch as it will wear out the clutch prematurely. When you stop, put the gear in neutral and off your clutch.
The most of the passenger cars do not need "double clutching" as their first 3 gears have synchros.
I recommend not to practice the manual on your own car as it will surely hurt your clutch. When I did this with my first manual car, I burned the clutch in less than 10,000 miles. I was lucky the dealer replaced the clutch under warranty.
It may fun for a while. But, once you start commuting for work (or driving as part of the job necessity), it gets tiring. I don't go back to manual anymore. I would rather be on the phone and checking email to be ultra-productive while driving instead of focusing on changing gears.