A major cost in foreign client work is insurance. Ensure you have adequate insurance as a free-lancer to cover litigation in a foreign court over at least , payment problems, cessation of contract, (voluntarily or enforced dismissal) and any 'obligation to your clients customers' if your work is resold.
I used a 25% uplift to get adequate cover for foreign ...
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 ...