Take some pics and post them, bloomer.
Sometimes it needs a bit shaved off the inside, sometimes the tip sawn off, sometimes it can be bent away, sometimes (but rarely in Shetlands, I think; more common in Swaledales) the whole horn needs removed or cut right back. (Latter is vet job, IMO.)
The dead bits are dead, so won't hurt him, but there are blood vessels and nerves running up inside, so how you go about it will depend on which bit and how much.