You may be able to use a capo to raise the pitch a few semitones (but you can't lower the pitch), or you can count up or down as you play each chord (which is OK for one or two intervals). Otherwise, it can get complicated remembering different keys or all the sharps and flats.
Here is a quick, easy and cheap transposer to easily change the key of any song. You just decide which key you want to change from and to, then set the wheel so that the two keys line up- and you can instantly see every chord you need to change to. Full instructions for how to use it are in Step 7 (and also on the free PDF download with the wheel design from my website - see below).
Step 1: What You Need
- A4 cardboard (best) or thick paper. I got coloured card from a $2 shop, or you can get it in a craft or stationery store. If you're using thick paper, it's best to laminate it.
- paper fastener - the split type that you push through and open put. If you can't get one, you could try using a twist-tie.
- laminating pouch if you have access to a laminator; you could use contact plastic. If you have reasonably thick card, you don't need to laminate or cover it - you can easily make a new wheel when it gets tatty.
You can download a free PDF design from my website, www.cathyschords.com