There is a Number of ways to kill giants easily.
first thing you can do is get alot of knights and make at least 5-10 of them attack a giant, it should be quick,or ge a large mass of them and it will be alot faster.
2nd thing you can do is try to get alot of crossbowmen near them where they can't be attacked,and he should fall quickly.
3rd thing is just Use alot of Giants and kill them.
theres alot more but that's all i can think of for now. hope that helps.
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Shadow of the Colossus
For free, kill dust devils, or fire giants.
You could either buy it from G.E. or obtain one under the house where Those giants live.
Hill giants are lvl 28. Many people like to kill htem to get big bones which sell for a decent price. They are found down the ladder in the small house west of varrok. You need a brass key to enter.
kill hill giants found in lv20 wilderness u could also go to the edgevill dunngeon but its crowded there.