I think i would want to start with a tank that i knew the tap has been left open for the last six months or so , fill it with water .... been there done that pretty scary , i'd say if you can get the valve off then fill the tank with sand till you get the door cut out then you'd be good to go after that . Note : we had a customer with a propane powered pick up truck that i converted back to gas for him , After every thing was said and done he left the propane tank here , the scrap yard would'nt take it , i then took all the fittings and the gage off it and left it to sit for the summer , later i cut it in half with the tourch and there was no Boom , the scrap yard took it then .... lol . I would think another good thing to use for thease small wood stoves would be a portable AIR PIG ... they come in two sizes , very safe to work with and no one has to worry about any one getting hurt . Thats my 2 cents , if you need help with any thing just remember am here for ya .............