Need more info:
Chassis: (ford, Chev, Dodge/Mercedes, etc)
Model: (e350, 3500, etc)
Year:
Tire Size: (16", 19.5, etc)
If you have a ford chassis, then chances are you have 16" tires/wheels. The torque is 145 ft/lbs. No problem for a 1/2 drive breaker bar and extension.
If you have the Chevy or Sprinter chassis, you probably still have 16" tires, but I don't know the torque values off hand.
You'll need a bottle jack and a jack stand, and a stable surface.
Jack it up to where the tires are still touching the ground, then loosen the lug nuts one at a time & gently re-snug them.
Raise the tires off the ground, put a jack stand under the axle, then lower the axle onto the jackstand.
Remove the tires/wheels.

That all said, I'd take it in to a shop & have them take care of it. You'll pay the same amount to get the tire(s) replaced whether you pull the tires or they do it.
A previous poster suggested rotating a front tire to the rear and replacing the fronts - that's a good low-cost method to take care of the short-term issue. However, if one tire went bad, the others _may_ not be far behind. Yet, they might run another few years/thousands of miles.
Some folks "peace of mind" will say replace 'em all now, but it is purely up to you.
Help that hopes!