let me start with the disclosure that im not a plumber
but in my qualified profession i am able to and have the equipment to solder copper joints (and have done in the past) but with these on the market
https://www.bunnings.com.au/smartex-...pling_p4700312 anyone can now days do it with basic tools , i usually use the spanner up ones with the olive inside that clamps to the pipe like
http://i.ebayimg.com/images/i/281157...-1/s-l1000.jpg
just trim the pipe up each end with no burs and fit
how ever id also suggest while the mains are off fit a tap in there also so if you ever have to change the dishwasher you dont have to turn the mains of just this one like doing a toilet tank , they now sell small 1/4 turn taps for this type of application