If I have a big pair on my hands and I'm in early position, I usually call and wait
If I have a big pair on my hands and I'm in early position, I usually call and wait for players who are after me to raise, then I re-raise and thus collect the maximum pot. It all depends on what kind of table you play, aggressive or passive. If the table is aggressive, then it is advisable to simply call. And if the table is passive, then you need to raise, no matter what position you are in.