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1.BME688 could be easily assembled.
2.BME688 has calibrated the hardware in factory production phase. If you use BSEC software to obtain IAQ in your application, BSEC will calibrate it in the software.
3. Reflow soldering with a peak temperature up to 260°C for 20 to 40 seconds shall be used (see following figure).
4,5: For placement and other suggestion, you could refer BME68x HSMI(Handling, Soldering and Mounting Instructions) document.
By the way, could we know your application information?