I don't have any soldering station but I need to solder the qfn package chip so how I solder it using a normal soldering iron.
I normally put some solder paste on the pads, place the QFN on the board, and reflow with hot air. With some trial and error you learn how much solder paste to put, but you really need quite little.
I have seen it done with the soldering iron as well, by following the process above, but instead of heating the device with hot air, you hold the device in place with tweezers and heat the pins one at the time with the tip of the soldering iron.
You can find plenty of videos on how to do it on Youtube.
If the PCB has not had any parts mounted on it yet (or at least none on the bottom) you could try a skillet. Dispense solder paste/flux, place the part, and heat until it melts. I have not tried this personally (normally I use a solder paste stencil and reflow oven). Of course you should not use the skillet for food ever again, particularly if you use lead-based solder, but even the flux may not be especially healthy.
Hot air is another way, but be careful with a cheap uncontrolled heat gun, it's pretty easy to fry FR4 let alone the chip with a $10 paint stripper heat gun (at least I found that).
If you don't have solder paste you might be able to get away with tinning the pads, applying lots of liquid flux to the chip and to the pads and heating it until the chip settles down into position. If you've designed the pads according to recommendations and placed the chip close to the correct position it should be pulled into alignment with the pads by surface tension of the solder.