Of course you should hire an electrician if needed, but if you are already familiar with doing your own home electrical work, this isn't any different. Installing a new 240v circuit is actually easier than installing a new 120v because you don't have to worry about balancing your circuit breaker. There's plenty of videos and tutorials to walk you through it, YouTube is your friend. I'm not sure I would take this on as your first home electrical project, but with some experience it is reasonable (and legal) to do it yourself. Where I live a $10 county permit is required, but that's it.
Also, depending on your transportation needs, you may not need a 240v circuit at all. For over 6 months I've been charging my Leaf from a 120v outlet (a.k.a. Lvl 1 charging). It is set to charge 6 hrs per night in the summer and 8 hrs per night in the winter. And we skip days sometimes. That's enough to cover 95% of our driving needs, and keeps the battery in the healthy 20% to 80% state of charge. You only need a 240v circuit (a.k.a. Lvl 2 charging) if your driving needs are higher. If you are a daily commuter, then I do recommended Lvl 2. I work from home, so I don't drive everyday.
If you want to use an existing 120v circuit for charging, here's a few things to check:
1) know what else is on the circuit. In my case, my EV charging circuit is also shared with the power tools in my woodshop. I never use my woodshop at night so this isn't a problem, and I know not to try to run a big saw while my car is charging. If I did it would pull too much amperage and trip a GFCI or possibly the circuit breaker.
2) make sure the romex wires and outlets are in good condition and relatively recent. Don't charge a car on 60 year old wires. Ancient wires can get hot and start a fire inside a wall under extended load. Charging a car at Lvl 1 pulls 12 amps for 6+ hours. Same as running an electric kettle or power tool for hours straight.
3) have at least one GFCI on the EV charging circuit. You can place it at the beginning of the circuit to protect the whole circuit if it is shared with other things (like my power tools), or you can have the GFCI be the outlet that you charge from directly, which is especially a good idea for you since your circuit will be outside and potentially exposed to moisture. As others said, it should be in a all-weather outlet box that seals properly with the EVSE (charging cable) plugged in. Installing your own GFCI is fairly easy to do, and you can get a $5 outlet tester to make sure you wired it up correctly and to ensure the GFCI will trip properly.
4) make sure your circuit breaker is working properly, and is big enough. A car charging at Lvl 1 pulls 12 amps, so a 20 amp circuit breaker gives you some headroom to pull more amperage for a short duration if needed. In my case, my circuit breaker and GFCIs are all 20 amp, which is plenty. A 15 amp breaker is fine if the circuit is dedicated to Lvl 1 EV charging, but is too small if the circuit will be shared. Upgrading a circuit breaker yourself is very easy and inexpensive.
If your house uses fuses instead of circuit breakers then the whole electrical infrastructure may be too old to support EV charging, and at that point I would recommend hiring an electrician.
And if all of the above is Greek to you, then perhaps hire an electrician
I've used my EV journey to learn a lot more about home electrical, and at this point I feel confident that to do most anything. I'll be installing my own solar panels later this spring and saving about $7k in labor costs by doing so.
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