Hello wonderful CC!
My writing is less than desirable. I have 2 cakes due this coming Saturday and this is the only part I'm worried about. I was reading the comments of one of Thanh Thanh's wonderful creations and someone mentioned printing the writing out in reverse and using edible markers to make a stencil on wax paper.
Can you guys give me more information?
Thanks, as always.
Edit to add: Sorry if this has been covered before, but I didn't know the term to even attempt a search. 
I have the same problem. I always worry about the writing. But I've gotten better, simply by practicing and not thinking about it. If you just write it without thinking it will turn out fine. I usually add some piping gel to make it easier to write. You can always buy the cake stamps and trace them. Good Luck
Like Brooke said practice really helps. I add white Karo to my BC-til it's fairly thin, and move your whole arm, not just your hand. If you mess up, wait til the letters "crust" then you can carefully remove them with a toothpick. I find it helpful to practice what ever it is I'm going to write on the cake on the bottom of a cake pan-that way you can make sure it will fit on the space, and it's easier to get the "feel" of the words.
HTH, and keep trying-it'll get easier! 
I used to hate to have to write on cakes. Then I tried something out of the ordinary, I now use royal icing and do it off the cake, I sometimes will write it on waxed paper similar to doing a transfer, and then once dried, place it on the cake. Has worked for me. (maybe I'm cheating or taking the whimpy way out, but, if I don't like how it looks, I am not ruining the top of the cake by having to scrape it off and start over.) JMO
I use the "pin prick" method and it works great for me.
Print what you want in the size and font you want on your computer. I match it up to the bottom of the pan to make sure it fits properly. Then print it off, take a sewing needle and prick holes in the letters right through the paper.
When your icing has crusted (or refrigerate it if it's non crusting) then place the paper gently on top of your cake and lightly outline each letter with your finger. This will press the "dots" you have formed on the back of the paper into the icing and when you take the paper off, you will have a clear outline of where to pipe your letters.
I got this idea off cc and it works great for me.
My writing is not that great, I have taken to writing out what I want on cake and practicing first, then write on cake, wait till crusts then if I need to adjust either use a paint brush dipped in cornstarch to straighten out letters and smoosh down points or just remove and try again.
i remember when i couldn't write to save my life. it does take a lot of practice...i mean literally...a very lot of practice. there are a lot of easy ways to get around it like to pin prick method and reversing the writing image and such, but the more you practice the better you'll get! 
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