Nah, that's what the syncros are for. Just makes a little farting sound
OK. Upshifting: as the revs go down, kinda sorta push the lever into the next gear, and when the speeds match, it'll push right in. If you're close, it'll get noisy. Be ready with the clutch the first few times, and your first few tries in the higher gears and/or under low speeds/loads. If you have a tach and with some experience you can better predict when to apply pressure.
http://auto.howstuffworks.com/transmission3.htm has a really good explanation of the sync process.
This advice free with the purchase of the standard disclaimer.