Each separate country has its own law (and lore) relating to heraldry. In almost all countries outside Britain it is perfectly acceptable to assume your own arms. If you are going to do this, my only hope would be that you take proper advice as to the design you choose to adopt. I have seen some weird and wonderful concoctions purporting to be heraldry which, had the would be armiger sought advice would have been far more acceptable.
Advice can be obtained free from a number of online societies; there is really no need to pay for commercial advice. Most amateur armorists/heralds delight in assisting would be armigers without charge.