They have long eye relief scopes and rail mounts that all you have to do is remove the pin from the rear sight, remove rear sight and install the rail mount. If you must have a scope this is the easiest for one to do at the kitchen table. No drilling no fuss no muss.
Every long eyw relief scope rail that I've seen that was made from Aluminum got wallered out and became loose after just 20 or 30 rounds. A siderail scope mount is much superior, barring that, try to find a steel rail.
What would be fun, if you can get some buddies together that have mosins, get a spam can for each of you and go out to the range and have a fun day. Blasting pumpkins/melons, etc...