should I transplant or is it to soon?

My plant is 3 weeks old and still small I want to transplant it to a better pot with better soil The container i Have now is clear and cover in tape but if you look threw the bottom you can see alot of roots all ready developed Would it be okay to transplant this early ?I am a rookie and never transplanted before and dont want it to die when i transplant

as long as you dont disturb the taproot or too many branch roots, you'll be fine.
first make sure you have an appropriate space ready in the new container (fill the container with soil, filling around the container you already have, to make sure its the perfect shape and size)
i like to make sure the top .5-1 inch of soil is packed tight, then place my hand over the soil, with my plant's main stalk between my middle and ring finger, and turn the pot/container over. gently tap all five sides of the container or just give the bottom a good whack, and it should slide right out.

When transplanting it is safer and easier if you wait until you would normally water your plant. Get your new container ready, place the new soil in the bottom of the new container to a line that will allow the transplant to sit easily on top of the soil and not be above the top of the new container. Gently massage the outside of the old container to keep the roots and dirt from sticking to the side of the container place one hand over the top of the old container with your index and middle finger encompassing the plant, turn the container upside down, a little shake and the plant should slide right out with your rootball intact. Place in new container gently fill with dirt, I like to tap the new container on the ground to get the new soil settle the soil. Water, I like to use a little superthrive in this watering to help in case of shock. Your done.
Hope that this helps, good luck.

Transplanting The Marijuana Plant

Unless you have planted your seeds into a pot large enough to sustain a full-size grow, then you will need to transplant your young plant one or two times, in order to ensure maximum yield. A healthy marijuana plant will soon outgrow its starter cup, and a root bound plant will grow very slowly. A good rule of thumb to go by is to check the plant size against the cup size - when the plant becomes taller than the container it is in, then it is time to transplant. Another indicator is droopy leaves or a plant that needs a lot of water - these are sure signs that your plant has outgrown its pot.
Another good rule of thumb is to transplant the marijuana plant into a container that is double the size of the current one, or larger. This allows the roots to spread out and develop. Marijuana requires one foot of soil height for each foot of plant height, so prepare to have a minimum of a 5 - gallon container for the final transplant.
Water your plant just enough to moisten the roots. If the soil is damp it will hold together better for the transplant process. Fill the larger container with potting soil, leaving enough room to set the plant and root ball in.
Place your hand over the top of the cup, keeping the stem between the thumb and fingers. Turn the small container over and ease the cup off the plant. Gently set the plant upright into the new soil, then fill in the rest of the larger container with soil. Give the plant a thorough watering, as this will loosen the roots and allow them to begin spreading and growing. Tidy up your area, and you are done.

if you see roots in the bottom of the drain holes its time to transplant. personally what i use are 6 inch pots for seedlings and clones. when the roots start showing in the drain holes is when i transplant into the container i finish in. depending on your setup and size you plan on letting the plants get, i would say a 3-5 gallon will be good. unless you plan on vegging for 60 days or more. so a 3-5 gallon will be perfect. and like the others said just be careful not to disturb the rootball. water your plant good to get the soil to compact then squeeze the sides to loosen from the pot then turn upside down and squeeze the sides of the pot until it slides out. after that just bury it and water in. if your soil mix contains mycorrhizae you will find that transplant shock is very minimal as long as the rootball is not disturbed. you can also buy as a powder and mix into a solution and water your plants in