For the erc20 tokens, you have to go to myetherwallet.com but it will detect your ledger and it's one click to access the tokens(http://www.autoadmit.com/thread.php?thread_id=3870056&forum_id=7#35230993)
trezor is great for btc tho(http://www.autoadmit.com/thread.php?thread_id=3870056&forum_id=7#35232520)