T Shirts are always difficult  because there is no definite grain- this is what I do, & I find it works every time.  I iron onto the shirt a thin iron on backing then the T shirt does not stretch either way too much, then pin on top of that quite a thick tear away backing if you have not got a thick backing pin 2 pieces -  remember all the grains must run in different directions this stops your embroidery from going out of shape when sewing.

6)How to centre and mark your embroidery

 If you can print a picture of the embroidery you want to embroider. fold the picture into a four fold and mark the centre point with a pen - then open it out and place it onto the garment exactly where you want to put the embroidery and mark the centre point on the garment - that will be your centre point of your embroidery - when you hoop it altogether try and get the centre mark on the garment  in the centre of the hoop. Put the frame into your machine, switch the machine on and go to your layout section of your settings on the machine and set your needle right on the centre mark, . then start embroidering .

7) Jump Stitches

There are usually Jump stitches in embroidery's which are mostly unavoidable, I find it easier to trim them after embroidering each color. Of course if you have a motif where there are lots of spots to avoid having to cut all the little jump stitches embroider them first then the jump stitches will be covered by the next area of sewing, but be careful because if the next color used in that area may be a lighter color otherwise rather trim them first. Also When outlines are not continuous there tends to be more jump stitches, and when there is a lot of detail in the embroidery you will also find more jump stitches, I usually trim as I go along, it may take a little longer but your end result is always good.

I have found trimming jump stitches at the back of the designs helps in that your designs tend to lie better.