I finished the Camino Portugues just this May and micbook is walking it now so yes you can access a load of information easily-give his blog a glance concerning heat etc. Firstly, there are not a lot of albergues open or closed between Lisbon and Porto at all so be prepared for the additional expense of pension-hostal-*hotels, 25-usually 30 Euro a night-you ae off season and may be able to haggle a better price. Do not skip Coimbra, a marvelous place, do climb up the hill in Tomar to visit the castle and convent. Lisbon is a wonderful city, I like Oporto even better however the walk out from each is horrendous unless you really like asphalt, oil refineries, car dealerships, furniture stores, docks, factories and workshops. The Camino is well marked after Oporto somewhat less from Lisbon but not that difficult to follow. Be prepared from some marvelous food but don't ask what its made from, the Portuguese are big on pork, leitão assado (roast suckling pig - no you are not served the whole piglet its served by weight) all very tasty, but they also use all the pig except for the oink to flavor soups, stews, beans-peas-lentils, lots of ears, snouts, sauces thickened with blood, trotters, and even the tail - they are also big on fish shellfish and salt cod. Do as all good pilgrims should say grace, eat, and thank your hosts, the food is great.