If planting in summer, choose a slightly shaded spot as chicory prefers a cooler climate (or plant it between rows of taller veg, like broad beans etc)
If planting in autumn, choose a spot that gets maximum sunlight
Plant in raised beds/traditional veg patch, or in pots - 1 plant to a 30cm pot, or you could plant 5 or 6 to a grow bag
Plant 30cm apart
Keep it well watered during the summer
Mulching will really help during hot, dry spells
If you feel the plant looks weary during the growing season, a nitrogen-rich liquid feed will normally perk them up quite quickly
Problems & Pests:
Slugsand Snails can sometimes bother chicory, especially while the plants are still fairly young
Bolting may be a problem during hot summer months - try to keep plants cool with frequent watering, apply a mulch and if possible give them a bit of shade.
Not turning red - chicory will normally not turn red until it hits colder temperatures in late autumn/winter
Pick off the looser, outer leaves as you want for salads etc
Once the centre of the plant has formed a firm heart, you can cut the whole thing off using a sharp knife a few cm above soil level - leave a bit of stump in the ground. This could be any time between late September and March/April the following year, depending on when you planted it.
Chicory will normally re-sprout if you leave the stump in the ground after harvesting. Worth a try!