There are a number of methods.
Using a regular enlarger and printing on Ilfochrome is the most straightforward in some respects, but given the contrast of any reversal material--slide and print--sometimes contrast masks are needed to get good prints. It's not hard to make them, but there is a bit of a learning curve, and it does mean it takes longer to make a print, because you need to proof, expose, process and dry the mask, proof again to be sure you've got it right, and maybe make another.
Another method is using an internegative, where you photograph, enlarge or contact print the original transparency ideally with a low contrast duping film, and print the internegative normally. It's generally a good idea to make the internegative in a larger format than the original. Also takes some practice to get the contrast and color right, but once you've figured it out, it's not too difficult. Interneg prints for color, though, aren't as crisp and vivid as well made direct positives on Ilfochrome. For B&W it's not a bad approach, but rather than duping film you might use ortho film as Ian recommends or a relatively neutral pan film like TMX.
Reversal processing of B&W paper is another option, and now there is a direct positive paper that uses the normal processing sequence available from Efke through Freestyle Photo. The contrast is high, so it might take some experimentation to figure out the best exposure and development techniques.
