Automotive waterborne paints are applied much in the same way as any solvent based product with the following notes to keep in mind.
Enamel is just a word used for a paint that doesn't leave brush marks when applied correctly, it does not matter what the chemical basis of the paint is. Enamel is the term used for the old baked enamel look we used to be familiar with and see on cast iron items, stoves, pots and mugs etc.
Don't use waterborne paints through your old solvent spray gun, get an HVLP that is designed for water borne, and don't mix the two types of paint between guns, the waterborne paint will ruin your old gun by attaching its self to minute particles of paint not able to be cleaned out of the glands etc delivering them to your job and your old gun will rust internally.
Waterborne paint has a slightly thinner finish build so will tend to show imperfections in your preparation more so than urethane's or alkyd's (common oil/solvent based paints )
You can't thin your waterborne automotive coating with water, you need the manufacturers thinner/reducer.
You can't clean up with soap and water and you have toxic waste to dispose of with waterborne paint just like any other.
You need lots of airflow and heat to cure a base coat, it will not air dry well in your neck of the woods!
You still need to apply a solvent based clear coat over the water borne base coat, the single pack enamel will have a high gloss but will be moisture sensitive, test your substrate by wiping part of it with a wet cloth (assuming it has not been sandblasted) if the water evaporates dry within ten minutes it is ok to paint it. (same for all painting)
Waterborne automotive paints are only slightly softer when fully cured than solvent based.
Waterborne paint is less toxic than most solvent paints but has toxic compounds in it and should still be treated as toxic, personal protection is just as important when spraying especially.
Waterborne paints have been developed because of the environment and do not necessarily represent the latest technology in adhesion and UV, but represent the latest technology in Waterborne automotive paints in line with the desired reduction of VOC's and paint waste. Waterborne paints main advantage is lack of VOC's released to the atmosphere during application and cure process, apart from that it is made up of mostly the same base materials as solvent based paint.
If you are doing DIY work at home stick to what you know, water borne is not home handyman friendly yet.
Read the instructions and spray as normal, don't buy cheap paint! (mind-you, you probably can't buy cheap water borne!)
I know you said three sentences but this is a restrained as I can be!
