It's not necessary, really. I leave all my roosters' spurs intact. If his mentality is good, his spurs will never be an issue. If his mentality is bad, even removing his spurs entirely won't solve the issue nor stop him acting out his violent mentality.
Some exceptions would include if he shows signs of initially being very clumsy with the hens, in which case you can file or cut off the first few millimeters of spur (unlikely that they'll be that sharp when he's that young, and unlikely that you'd need to remove more since it's just the very point that does the main damage in scratches caused by being clumsy). You can use toenail clippers, wirecutters, secateurs, scissors, whatever, or if you're not confident that you won't hurt him using such tools, a file or dog-claw clippers.
Anything more than a few millimeters off the tip can cause bleeding though. It likely won't hurt, or more to the point he won't show you it hurts, but flowing blood can also enable pathogens access to the bloodstream so worth dusting it with something to stop the flow if it doesn't rapidly stop by itself.
Some roosters have badly angled spurs that point inwards so normal dismounting after mating causes flank tears. I cull that bad spur trait out though, not breed it, as trimming them requires re-doing every few weeks and why keep breeding more work for yourself since his offspring will likely inherit it... However an otherwise decent male you've gotten attached to may be worth an exception there. Just bear in mind that if he's that sort, then as he grows, his spurs can injure both other chooks and his own legs accidentally, and you may breed otherwise beautiful chooks that have to be culled or require constant extra care to fix this issue generation after generation. He could accidentally disembowel your hens too and kill them with such spurs. He can also accidentally pierce his own guts if they're angled badly enough. I've seen some roosters with scars all up the inside of their legs due to their spurs, having to high step over them just to walk, tripping and harming themselves regularly never mind the hens, and also other males who are exhausted and can never sit down, not even during the night on the perch, because their spurs will wound their bodies. Good spur angle is important.
If he's aggressive to you or the hens, then I'd cull, not try to blunten his weapons, because even with wobbly, blunt, soft spurs they can do significant deep tissue trauma and bone bruising on adults, never mind kids or small animals like hens.
Best wishes.