Yes, you might want something with a bit higher resistance to start off with. Remember it will be driving at 4.2 volts with a fresh battery, and the voltage will drop as you use it. There's no cut-off, so if you hold the button down it can fry the juice and the coil. I have a love/hate relationship with my mechanicals. 4.2V x 4.2V / 2.8ohms = 6.3 watts (or in English, volts squared over resistance equals watts. I can use the Protank with a higher resistance coil on the K-100 but an RBA is usually a good/better choice, but it has to be running well.
Be very conscious of your battery. You don't want any shorts, and you don't want to run the battery below 3.2V (I don't run mine less than 3.5V, worst case - it's just nicer for the battery). The usual battery safety tips are very important with mechanicals. Use safe chemistry batteries (or know the risks), don't use a battery straight off the charger. Test the battery voltage before using it, and fire it well away from your face the first time you use a fresh battery. It will have vent holes, that means if the battery did let go, that's where the really hot gasses are going to be coming out of (this goes for all mods, not just mechanicals. IMO they put the vent holes in the wrong places a lot of the time, like next tot he button).