The kits are pretty easy to build,as long as you take the appropriate safety precautions when powering it up.Bear in mind there are potentially lethal voltages in these amps! You will find WD very helpful with any problems,and I'm sure any here with experience would be happy to help if you run into any problems,or you would find plenty of willing helpers over on the WD forum.Alternatively,look out for a secondhand already built one.They come up now and again,either on the forum or ebay.