Hi Sam.
Yes you can use your own printer, either ink jet or Laser. You will need to buy the correct type of decal paper depending which type you have. The special printers you have heard of are able to print white. This is some thing that not even the best ink or laser printer can not do. This is why you can buy decal paper in clear or white. If you need a decal with white or very pale colours you will need yo buy the white paper.
After printing you will need to fix the ink to prevent it bleeding out when you put the decal in water. You can buy the fixer the same place as the paper. I have had mixed results using acrylic clear coat. Remember these to are water base and the trick is to mist the coats on very lightly....
The one big problem I find is that the clear decal film gives you just that. A decal that is VERY see through. The only thing I print myself now are black serial codes. I use an ink jet a canon pixmar. Even after running the same sheet through the printer four or five times coloured
decals have always come out see through. If a laser printer gives a better result? Some one with a laser printer will have to answer that one. Laser printer
decals do not need fixing, Just print out and use.
No Tutorial I know, but I hope some useful info none the less.
Ian M