When you cut your fabric for the bias that you need for your vine, make sure it's on the 45* ....cut 3/4"strips, if you don't have the little buckle thingy that helps you press the bias strips..... then put a pin in & out on your pressing board..... with the space 1/4" between the pins..... take your 3/4" strip and fold both sides in 1/4"and then pull the end through under the pin.....place the tip of your iron on this and slowly pull.... your iron stays in one place, the strip pulls through under the pin....and hopefully you will end up with 1/4" finished bias. When you pin your bias stem on your fabric, remember to stitch the inside curves first & then move on to your outside curves....not sure if I've explained this well enough, but please PM me if you think I might be able to help...