This is not just a religious place. It an experience! The pristine precincts of the temple transport you to another world even before you enter the sanctum to pay obeisance to the Guru Granth Sahib, seated in all its glory and divinity.
It will be an understatement to say that the place is spotlessly clean and astoundingly well managed. It was bustling with tourists & devotees and there was a long queue in waiting to get the darshan. But there was no chaos, no 'chalo chalo aage bhado' like one finds in most other religious places (when crowded).
Large bags, backpacks, phones, cameras, etc. are not allowed inside the sanctum. Make sure to deposit these in one of the cloakrooms that are located within the campus.
We had a dip in the sarovar. There is an enclosed area for women, so it was a hassel free experinence. Devotees are only allowed to take a dip (and not bathe) in the sarovar. If you wish, you can bathe, after the dip, under running water from one of the taps that are there in the bathing area. But there are no washrooms near the bathing ghat which might get a little inconvenient.
Photography is allowed in the premises but not inside the sanctum. Keep your head covered at all times, they are extremely strict about it. Carry a scarf/ dupatta or you can borrow one from the sevadars while entering the temple. There are many vendors selling scarfs around the temple. You can even buy one for really cheap.
We visited the place in late afternoon and then again late at night. The sanctum is closed at night but the premises and langar are open. The golden temple, resplendent with night light is a sight to behold. This place just gets to you.