The world number one, who has won the tournament twice, was knocked out in the first round at SW19 12 months ago.
The Spaniard will face Slovakia's Martin Klizan in the opening round of this year's event, which starts on Monday.
"Wimbledon is very special. Being able to play well with that little bit of extra confidence and less pressure will be important for me," Nadal told Sky Sports News.
"In the last couple of years, I was not able to play well here so I'm going to try my best to play well again.
"I'm practising as much as I can, as hard as I can, with the right attitude, then we will see what is going on."
Nadal heads into Wimbledon having won a record ninth title at the French Open.