my install was a fresh install (always done it this way, system and personal files are seperate. if the system goes down, i am back up and running in less than an hour...although i dont back up my personal data, i REALLY should. i am building a home server for all my data and backups sometime next year, so until then i am rolling the dice. although i have used a computer since 1990, and didnt start backing things up until jan '10 when i bought my first mac). i did not use any instructions, so what i did may be different. this is exactly what i did, in this order...
1. made bootable clone with carbon copy cloner ( i do this every month anyway)
2. booted to bootable clone (optibay in late 09 macbook, using factory 250GB 5400 rpm drive for data, 120GB owc ssd for system)
3. completely erased system ssd drive, followed by "erase free space"
4. installed lion from DVD (i made the dvd since i always do a clean install)
5. lion booted, setup, played around for about 3 mins before noticing my audio was very quiet (hit volume buttons and it said volume was max, but had a circle with a line through it)
6. rebooted thinking the audio thing was a freak mistake, problem persisted
7. repaired permissions after searching for an answer, there was about 12 permissions that needed repairing.
8. still no luck, some more searching, found plugging in headphones for a few seconds made the volume work normal until reboot. i can deal with that for now.
and the whole time it was FAST. after the initial install, i thought something went wrong because i was reading a magazine while i waited for it to install. i noticed the computer reboot, and thought ok, i have a few seconds, i will finish this paragraph. as soon as i looked back to my magazine, the setup was up. i thought maybe it was just because there was nothing to load on initial setup. after rebooting to try to fix audio, i realized it booted to the login screen FAST. i set it up to automatically log in, and from pressing the power button to a usable desktop is about 12 seconds
edit: after reading some other posts, it seems like the clean install is the way to go.