Its not too expensive, but kind of a pain in the butt. You should be able to find hollow axles for around $5 each and the skewars for about 15 a pair. If you have ever serviced a cup and cone hub before then go for it. If you have not serviced a hub before then you might be biting off more than you can chew. Also make sure the thread pitch on the new hollow axles is the same as the old axles. You may have to trim down the new axles to fit the bike, then you will need to clean the threads in order to get the various parts to screw back on. Keep in mind QR axles are slightly shorter than the outside dropout spacing, if you make them too long the QR will not work.

Why on earth would you want to put 26" wheels on a road bike? You will probably have all kids of brake reach issues if you do this.