well, we don't do it ourselves, and I guess that the company providing these kind of heating does know the rules and how to do it properly. There are quite a few victorian homes in this district of Hobart, I will most likely ring at some of them and ask them about what kind of heating they are using and what they did with their fireplaces - Tasmanians are very friendly and open for a chat, I guess that will be a lovely time chatting with a nice cup of tea - maybe even a good way getting to know the further away neighbors as well.Just make sure you get your ventilation sorted out as part of fitting.
I've no idea what the requirements are where you live but as a general rule, allow enough fresh air in to equate that burnt.
Part J in UK building regs or your equivalent. Messing this up is very dangerous.