Airbrushes are easy to use if you just want to basecoat. More advanced techniques and finer details can get to be pretty hard - but it's very enjoyable pracitcing and learning ; )
I bought a cheap one of ebay to practice with for a while before getting a Badger Krome. I think it was a good idea as I mistreated it a little and learned a lot more about how to care for it in that time. Badger and Iwata both make great airbrushes, you won't go wrong with either brand and from personal experience I can say I really like using the Badger Krome - though I only have a cheap one to compare it to.
If your'e going to start airbrushing, you should check some youtube videos ont he subject, these ones are a great place to start:
WGConsortium
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Getting Started Using an Airbrush (Airbrushing Intermediate Part 1) -
The Airbrush and Complete Overhaul (Airbrushing Intermediate Part 2) -
Airbrush Color Changes and Cleaning (Airbrushing Intermetiate Part 3) -
A Look At Cheap Airbrushes Awesomepaintjob / Les Bursley
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Airbrush Rant Would highly recommend subscribing to these guys, and if you're interested I can link some more channels with good airbrushing vids. The airbrush rant by Les will give you a good overview of the different airbrushes and should help you decide what you want from yours.