Advice on painting a Hobbytrain Taurus please

Hello everyone,

I'd like advice on painting a Hobbytrain Taurus (see pictures below). I currently don't have any painting equipment and am seeking advice on whether an airbrush is recommended or not in N scale?

The specifics are that whilst I'm applying full colour stickers to the sides I need to paint the front and rear ends in metallic gold. Fortunately the ends of the model don't have very much detail and so I would hope I could get away with using spray paint. Could anyone recommend a good type/brand to use with a smooth finish or particularly fine spray? I think some exist for model plane makers?

Or would people say that I should invest in an airbrush to get a smooth finish/thin coating? I'm not sure if I plan to do many paint conversions but I imagine an airbrush can be used for layout detailing, weathering and all manner of other useful things once you have one...

Thanks in advance for any advice,

Goedel