Aliens

There are of organizers to choose from. Some of them very handy. They will help you to keep organized while stitching. For example you can use a pincushion to stick your needles into. There are a lot of thread organizers too.

In order not to lose the needles for cross-stitching, you can glue the magnetic strip to the inner lid of the box in which you hold the embroidery threads and other cross-stitch accessories. You will no longer lose them and you will can easily find the right needle.

Embroidery hoops and frames help to the fabric in right position and to keeping stitching tension even. If it is possible, choose a hoop that will be bigger than your design, this way you will be able to complete the x-stitch project without repositioning the frame over stitched work.
Don't forget to remove your embroidery hoop in between stitching sessions so that your aida fabric does not stretch.

I assume that you yourself understand this, but still I will say. It is very important to wash your hands before touching the fabric or thread. Of course, you are going to wash the finished cross stitch design, but why make it dirtier?
In case you use a thread or fabric that is hand-dyed wash them in advance so that they do not stain your handwork.
Unwind your thread from time to time. Just leave the needle and let the thread loose - it will unwind itself... Or help it a little to unwind.
Do this every few stitches, otherwise the texture will be uneven and the fabric will show through your stitches too much.

Don't leave the project in the hoop overnight. When you're done cross-stitching for the day don't forget to take it out of the hoop. Your embroidery project needs rest to!
And another important thing. No matter which direction your top leg of stitch is going, but please be sure that they are all going in the same direction.