Why was Han so sure the Millennium Falcon wasn't being tracked?

Question

In the original Star Wars, the Millennium Falcon escapes because Darth Vader convinces Grand Moff Tarkin to allow it. The ultimate strategy is to track the ship to the Rebel Base.

TARKIN: You're sure the homing beacon is secure aboard their ship? I'm taking an awful risk, Vader.

Shortly thereafter, Princess Leia suggests they're being tracked, and Han is his usual cocky self in responding:

LEIA: They let us go. It's the only explanation for the ease of our escape.

HAN: Easy? You call that easy?

LEIA: They're tracking us.

HAN: Not this ship, sister.

Obviously Han is wrong, but why is he so sure he's safe from being tracked?

Why would the ship make any difference to the Empire's ability to attach a homing beacon?

In Episode II: Attack of the Clones, we see how easy it is for Obi-Wan to attach a tracking device to Jango Fett's ship. He simply throws a disc at the ship, and it sticks to the outer hull.

As a smuggler, shouldn't Han know about the technology behind "attachable" tracking devices?

Answer 1

Solo was one of the best smugglers in the galaxy far far away and was quite cocky, not believing he could be tracked.

The are several quotes from the original trilogy that show Solo was cocky:

Han Solo: Look, Your Worshipfulness, let's get one thing straight. I take orders from just one person: me.

Princess Leia Organa: It's a wonder you're still alive.

Also,

Han Solo: Han Solo. I'm captain of the Millennium Falcon. Chewie here tells me you're lookin' for passage to the Alderaan system?

Ben Obi-Wan Kenobi: Yes indeed, if it's a fast ship.

Han Solo: Fast ship? You've never heard of the Millennium Falcon?

Ben Obi-Wan Kenobi: Should I have?

Han Solo: It's the ship that made the Kessel Run in less than twelve parsecs. I've outrun Imperial starships. Not the local bulk cruisers mind you, I'm talking about the big Corellian ships now. She's fast enough for you old man.

and

Leia: “I like nice men.”
Solo: “I'm nice men.”

again to Leia:

“I think you just can't bear to let a gorgeous guy like me out of your sight.”

and again to Leia:

“Why are you following me? Afraid I was gonna leave without giving you a goodbye kiss?”