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Make sure the liners are wide enough to fit the wall they're going into. Ideally should be done before the spreads have come in (but not essential) if so they want to sit about 3mm proud on each side so that they can be skimmed flush.
However.........
In your house you may need to make them to measure. This isn't the end of the world just rip down pine boards to size (preferably engineered timber to avoid cupping etc.) The hardest part will be forming the rebates, it's best to use a router for this.
When installing use at the very least a reliable 6' level, but a laser level would be better, to ensure the uprights are straight and plumb. You also need to check the head for level. Pack the uprights against the wall in 3 or 4 places and put a screw into the wall through the packers (make sure this screw will be placed so it is hidden by the door stops.
Architrave can hide many fuck ups so long as things are straight, plumb and level.
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Bobbo
New door liners and doors (internal), what do I need to know before I try and do this myself?