Most people's first few attempts at incubation are a steep learning curve. Well, that's a much nicer way of putting it than saying a total freakin' disaster! I got four chicks out of a dozen eggs with my first hatch, and thinking back, if I'd known what I'd been doing I'd probably have managed to get 10 or more. I know it's difficult not to get upset and not to get disheartened, but the trick really is just to keep on trying. The Janoel incubator is one of the rarer ones, as in not many people on here use them and so when it comes to asking advice it'll be harder for you to find advice relevant to your own bator, but quite a few people on here have reported great hatches with them - I think they're mostlyfrom Australia, so maybe it's more popular over there.
For your next hatch make sure you go over all the basics again. Clean and sanitise your bator thoroughly. Maybe invest in a cheap digital thermometer that stores max/min temps, so you can see if you're having any temp fluctuations that you might not have previously noticed. Make sure your thermometer and hygrometer are measuring accurately. It's amazing how many of them don't! Take notes throughout the incubation. They can help you pinpoint problems, and you can use them to jog your memory for things you might have forgotten about from one hatch to the next.
From reading posts on here, and from my own hatching experience, I think the thing that causes the most problems for most people is humidity. It's difficult to get right straight away as it really can just be trial and error. What suits one person won't necessarily work for another, so beware of people who confidently tell you that your humidity needs to be X, Y or Z. What they're usually meaning is no more than 'Well, X, Y or Z worked for me...'
The other thing I'd say is that compared with using an auto turner, hand turning eggs adds another element of risk, just cause you'll be touching every egg three times a day at least. Make sure you scrub your hands well with an antibacterial soap every time you're going to turn your eggs.
Good luck for the next hatch!