It can sometimes sound a lot worse than it really is.....
As long as you have the correct color temp light bulb, you have good light penetration to plants, on a long enough photoperiod and plant the plants properly....all should be fine...
Its better to remove the plants from the pots and remove any rockwool-don't worry about trimming or removing some of the roots along with the rockwool or pot...Then plant them in the substrate if they are substrate planted plants. With your stem plants-they can be planted at any dept and with the rosette type plants...like swords, sags, vals, crypts-make sure the crown is slightly above the substrate so they don't rot.
It can be overwhelming in the beginning....Take a deep breath-smile and have fun-trying not to worry too much and it will all come together in time....