I suggest you look for a brand of bars which supports their product with good instructions, supplies all you will need (wire extensions etc), possibly even has a video. Be aware that novices post up around HDF often, with wiring problems down to poor workmanship when swapping bars, especially when doing internal wiring. Take a look at the Harley's website for their aftermarket bars, as they come with good instructions, which you can read on-line, even print off. They will provide you with a starting point, at least.

 

 

Some bar brands may even include longer clutch cable and brake lines, if the bars need it. Hopefully someone more expert will call by soon!

 

 

 

Installing internal wiring is very time consuming, unless you can find bars pre-wired, if such things exist.

You may find more help in the Softail section, where there will be more members to offer help and advice.