@rk. you may google for youtube videos on assembling several parts of the bicycle. The procedure depends on your particular components but in general is not much different.
You will need a set of allen wrenches, chain breaker/connecter tool, wire cutter and something to pressurise their ends and a tool for your BB.
also, water spray is useful when assembling steering handle to lubricate parts temporarily
@Rilakkuma it's more about needing a special single-use pin to rejoin the chain, and many people not having a chain breaker at all. Since you don't have to break the chain to put the bike in a box, why do it?
@rk. I'm guessing all you need to do is put the stem on the steer tube (look up threadless stem installation), stick the seat in the seat post if it wasnt done already, and then install the wheels (make sure if you have quick release you put them on correctly). You might want to post some pictures or something of the disassembled bike. Then its just breaking out the hex keys and adjusting the saddle and what not.
@Mσᶎ Lots of chains come with quick links to avoid the chain breaker problem in under 10 speed (KMC has the option, SRAM has the quicklink - Shimano uses their own stupid pin thing). But likely the chain is still on the bike.
@Batman yes, but a quick link doesn't require a chain break. So me saying "you shouldn't need a chain breaker" applies even if the chain has a quick link.
@PeteH Never really saw the point in owning that - needlenose pliers work well enough if necessary, and I really don't break my chain except when I need to replace it, typically. The main reason I prefer the quick link to the Shimano pin is that it always works without fidgeting on installation.
@Batman I must admit I was anti-quick-link for a long time, I'm only a recent convert, and it is thanks to this tool. I watched a mate struggle a couple of years ago trying to fit a new chain, wrong length, take it apart, etc. etc. He had a helluva time.
I also used to steer clear of the Shimano pins - new chains invariably need shortening so I'd always just use a chain tool to shorten then join the chain.
Never had any problems until I got a Shimano directional chain. Don't know what it was about that chain but I screwed it up well and truly. Threw it away in the end and went back to a non-directional chain which went on perfectly.
Don't know whether I was having an off-day....
But whether needle-nosed pliers would do the same job for removing quicklinks, I'll take your word for it as its something I haven't tried.
@PeteH The tool is a bit quicker and can help you close quick links (but I never had a problem with the closing part). However, the tool is something like 20 bucks for the Park Tool version, and I just don't see the point of it.
@Batman I went on a bike mechanic's course a while back and this was one of the tools I found useful. I picked up probably a dozen or so things totalling maybe USD250. Had I been sitting at home with a chain I needed to break.....maybe I wouldn'y have bought it.
The guy who ran the course also sold the tools, he goes out to India a couple of times a year and buys from the same factory that produces Park tools (he says). But even if untrue, it is quality stuff. Picked up a wheel jig from him which he charged 1/3 of Park's price.
Tell me, do you just maintain your own bikes? From your answers on the site, I'd assumed you were a mechanic