If you want to try it at home without specialized tools, here is how: Make sure the extractor is clear of the barrel, and the rib and dowels are off. Pad a vice and hold the receiver firmly. A vice with large jaws will minimize risk of receiver damage. You need to hold the receiver firmly, not crush or twist it. Take some 1/2" rope, double it, and start wrapping it around the barrel from the muzzle end. When you get to the hanger, run a strong hardwood bar - pick handle, etc. through the loop. Wind the rope tighter on the barrel. When it stops winding, you can apply torque to the barrel, and perhaps it will unscrew. I have removed '94 barrels with the rope trick, never tried it on a No. 1, it won't work on a bolt action. I've broken 1/2" nylon rope trying. Experimenting on scrappers. RH threads on a Ruger. Make an index mark if you are going to reinstall the barrel.
For an action wrench for flat sided receivers, use a couple of 1" square steel bars, one about 6" long, the other a couple of feet. Drill for bolts, thread one bar, oversized holes to pass the screws on the other. Clamp this onto the receiver with non-marring shims. You can make a barrel vice similarly, mine uses 1 1/2" barstock, 7/8" clamp bolts, with a bored bushing hole, half in each piece. I use machined aluminum sleeves, but you can make clamp blocks from hardwood, with bedding compound to get a perfect fit on the barrel. Use powdered resin on the blocks. No. 1 barrels have the extractor cut, which must be properly indexed, of course. Generally speaking, fitting a new barrel to a No.1 is more complicated than fitting a barrel to most bolt actions.