I'll preface the following by pointing out that I am by absolutely no means an authority on this - I'm working my second grow, and the first wasn't trouble free, to put it mildly - ha ha!
However - before starting the second one, I did a fair bit more reading - and I have every reason to believe it will go much smoother than the first (fingers crossed!).
For the second grow - I mixed up a simple organic mix, which apparently had good results for a number of people.
I mixed up a cubic foot of soil - 1/3 sphagnum peat moss
1/3 worm castings
1/3 perelite
To which I added - 1 cup of Dolomite lime
4 cups of glacial rock dust
1.5 cups alfalfa meal
3.5 cups of amendment - made up of a mixture of organic fertilizer (4-4-4), organic blood/bone meal, Neem meal, veg targeted bat guano (higher in N), and bloom targeted bat guano (higher in P).
I mixed well - moistened well with a mixture of water, molasses and kelp concentrate tea - and left it to cook for a month, mixing once a week.
I planted a germed Hobbit seed directly into this soil - and it is progressing nicely (Day 32 above ground) so far.
From what I've read - the safety factor lies in the cooking time. Freshly mixed organic soil is very much hotter than a mix thats had time to cook, break down and mellow over a stretch of time.
Anyway - take all that for what its worth - I'm very new to this, and this is my first grow with a organic soil mix - but I did my "due diligence" and researched quite a bit more than I did before starting my first grow.
Great luck with your grow - whatever you decide!