I'm new to growing, so I don't have much advice to give on what to do, but I sure have a ton of advice on what NOT to do.
1. Don't squeeze the rockwool. Squeezing rockwool destroys it's ability to hold air. Instead of semi rigid growing material, you'll have a soggy water filled sponge on your hands and a swimming pool for your plant to drown in.
2. Don't feed the recommended amount of nutes listed on your nute bottle, always give half or 3/4. Let them want food. Don't let them hang between the nutrient burn cliff and max possible nutrients.
3. Don't write down a schedule of water and feeding. Let your plants dictate a schedule and stick to it. If you plants leaves point upwards, they want water. If they sag downwards, they're drowning.
4. Don't try to rip of the seed from the seed leaves just when your plant sprouts because you want to help it out. It will let loose of the shell on its own. Otherwise you'll end up ripping a seed leaf off.
5. Don't mix nutrients with water straight from the tap. It's full of crap your water company used to make it safe for human consumption. Let it sit for at least a day.
6. Don't germinate you seeds where there's light. Like in tuperware on top of you light reflector :D . When you put them in the dark they pop out like there's no tomorrow.
7. Don't try to figure out the best way to do things over and over again. You can't make an educated decision about what's best without giving each method at least a few days to a week.
8. Don't foliar spray you plants when their under an HPS. The heat from the lamp steams off the water and melts your plants.
9. Don't buy seeds from
www.buydutchseeds.com. Those fuckers still haven't sent me my seeds, and they won't answer my help requests. :( I've purchased seeds from Gypsy Nirvana's and dope-seeds.com two weeks after ordering from buydutchseeds, I've already received my seeds from them.
10. And most importantly. Don't baby your babies. Sitting next to your plants and admiring them, makes you want to OVER water, OVER leaf spray, OVER fertilize, and OVER ventilate. If you grow cab or room has a means of ventilation, additionally opening the cabinet and sitting their watching your babies only disrupts the temperature and humidity. Pay attention to your plants by setting up a good environment and leaving them alone except for scheduled watering, feeding, and inspecting for problems.