Resealing ash dining table

Call me Al

My ash kitchen table is looking worse for wear. It's 14 years old and gets a lot of daily (ab)use. The varnish has worn off in the high traffic areas and I really need to redo it.
Is this something I could tackle myself?. I wouldn't use a belt sander for fear I'd damage and pit the top of the table but I know it will need to be sanded right back.
So that's sanding blocks and white spirits, but what do I use to reseal it and bring out the beautiful grain of the wood again?
Any pointers or sdvice would be greatly appreciated.

New Home

I'm not an expert so take this with a grain of salt, but I remember a flatmate of a friend of mine 'restoring' their kitchen table just by sanding it by hand (no white spirit) and applying a couple of coats of flatting (which, I believe, is a type of varnish for boats), and their table turned out very well.

tabby aspreme

You could sand it with an orbital sander up to 220 grit paper, then wipe the timber with a damp cloth to raise the grain, allow it to dry , then sand by hand with a block along the grain again using the 220 grit paper, if you put a few light pencil strokes on the timber you can see your progress as you sand. As for a finish its hard to beat oil based polyurethane varnish, two coats, lightly sand with 320 grit then the final coat