You can buy everything separate of course and there are several you tube videos of making your own DIY fixture/clamp/vice dingle-bop thingy to press the tuning onto the fittings. Some fabbed up riggs are more thought through than others.
Whatever you do DO NOT HEAT THE TUBING within 10" of a fitting. I've seen some ding dongs in videos use a heat gun to make the tubing easier to press on the fittings. Heating stress relieves the Nylon, lowers the hoop stress A LOT and the tubing looses all its "clamping force" and promotes leaking or a worse failure.