If you have a computer - preferably a Mac - then it's a doddle. Basically, the problem is always finding the machine to play the tapes. If they're VHS, then all you need is a cheap Analogue - to - digital converter. You plug the output from the VCR into the 'analogue' input on the converter, then connect the digital output to your computer - usually via a usb2 port - where you can edit it and then record it to a DVD.
If you have a Mac, the whole process is far easier, but it's doable on any computer.