This is a picture of a tele I used to have:
as you can see, the bridge pickup
bolts onto the bridge plate and the neck pickup
is screwed into the wood, not through the scratchpalte like in a strat.
Both methods are simple. For the ones that screw into the wood you need to put some kind of foam under the pickup, to push it up, while you tighten the screws to bring the pickup to the desired height.
One thing, 'though: the pickups of a telecaster are NOT the same dimensions of a strat single coil. The neck pickup is thinner, so you'd need to widen the gap in the scratchplate, and the bridge pickup is wider (and maybe a bit less deep too), and of course a strat pickup doesn't have teh right mounting holes for the tele bridgeplate...
You should consider that before you decide you want those strat pickups on your tele.