How to install recess lighting, is it hard?

Depends on the construction of the house and your skill level. The problem is not so much cutting the holes for the housings if you have a newer house with drywall ceilings (you will need to buy "old work" housings that can fit in through the holes) but in fishing the cable to feed them through the walls and ceiling spaces. Unless you are a pretty skilled DIYer this could be a real challenge for you and you would need some specialized tools like flexi-bits and fishtapes. If your house is older and the ceiling is plaster it will be a really tough project. Also, if it is a recessed area (like a tray ceiling) you may not have enough clearance for normal-sized recessed lights. if you have access from above from an attic space it might be do-able but that would be unusual unless you live in a ranch-style house.

I would not reccommend this as a DIY project if you don't have some previous wiring retro-fit experience.

If you are a capable DIY'er, absolutely! If you have and attic above the ceiling your working on, definitely do-able!

Here is an easy way to grab a switchleg for your recess lights. Note- attic access required.

Remove the lite kit from your fan (assuming your light is switched seperately from your fan). You'll be putting recess lites up, you won't need a lite kit anymore, right?

Drop the canopy on your fan, and open a knock-out from your fan box. Fish a wire into the attic through your fan box. Run it to the first location for your recess cans. Then from there to the remaining locations.

Home Depot carries a wide variety of recess lights. Halo Lights are a reliable and a cost effective fixture. For a 4" can use a H99RICT. For a 6" can use a H7RICT. Both are remodel fixtures that can be installed from below your ceiling. Both cans are rated for direct installation in insulation. No overheating and no fire hazards.

Wire your recess lights according to the instructions.

Note- Make sure your wire is sized the same as the wire in your fan box. If it's 14/2 w/ ground, add the same wire to it.

Note 2- Turn off circuit before you work. Check to see what goes out when you do. General rule of thumb is 12 openings (outlets) per circuit. Or 80% of your breakers amperage. If you have questions computing your wattage for your circuit, you can e-mail me and I'll figure it out for you.