I was truing my wheels when I was ten years old. Give it a go yourself mate.
You'll need a spoke key to fit the nipples around your rim. Turn the wheel slowly to identify where the buckle is. Once you've done this, tighten the spokes (nipples) on the side of the wheel you want to pull the rim back towards. I.e. if the rim is moving left of middle where the buckle is, tighten the spokes that connect to the right hand side of the wheel where the buckle is. If they are already very tight (unlikely), loosen the spokes on the left side where the buckle is.
Do some reading online anyway. Give yourself a bit of time, don't tighten any nipples too much (rounding could become a prob) and I'm sure you'll be right :thumb: