The most of experienced freelancers always advise never abandoning your current job. If you wish to freelance only do it keeping your current one and working part-time as freelancer. At least it'd be ideal in the freelancer point of view. Think carefully to respect of that your current one would be, is actually your more secure foundation.
To freelance is a ...
Basically, this will come down to your personal circumstances.
There are a few factors one generally needs to consider when going alone:
Your financial situation
The reliability of the first client (do they have enough work; will they pay)
How likely it is that you will be able to attract other clients
How your jurisdiction views self-employed people with ...