In order to be able to make small details I used Swedish Tracing paper.
Swedish Tracing paper is normally used for- you guessed it- tracing patterns. It is a kind of non-woven and you can sew right through it without dulling your needle.
Step 1: How to Prepare Your Print
Print onto regular printer paper to check the size.
Cut at piece of Swedish tracing paper roughly the size or your printer paper. Attach to printer paper using double sided tape. (Not regular tape as that is going to melt and ruin your printer).
Print again. I chose to print my tracing paper upside down since the original top side was slightly wrinkeled.
Step 2: Pinning and Sewing
Pin tracing paper to the front of your garment and pin the contrating fabris to the back.
Use your sewing machine and stitch all the contours of the letters. Use stitch length 2-3 mm.
Step 3: The Most Boring Part...
Pull the threads to the back side. Tie knots.
Step 4: Time to Get Rough
Be careful though not to rip your seams.
Step 5: Be Careful. Be Very, Very Careful.
You are going to cut the fabric inside the stitching without cutting the backing fabric. I repeat. Without cutting the backing fabric.
Using the same kind of carefulness cut excess fabric on the back side.
Step 6: Almost Done!
If you did not, finish it all by using the front you made to make a T-shirt to your favourite girl!