I came into indoor growing myself recently and am a few weeks off my 1st harvest,,so its all pretty fresh in my mind and I'm still learning heaps everyday.... I started my grow room intending to go with a new potentially amazing technology,,,LED lights for growing....they are great for vegging but I have got my self 2 HPS for flowering...apart from trying to get my head around the lighting etc...my 1st problem was I planted my seeds before I had set up my room )....so I kept them under a table for about 2 months b4 I could move them into their new home..(I had tha table proped up on bricks and just added more bricks as the plants got bigger).too impatient was my 1st folly... my second problem was a ride on effect of the table saga ...I had an out break of spider mites

....any hows I cleaned that up with a pyrethem based product and am now very carefull about when I go into my grow room...try not to go in to your room more than once a day,,,never go from your garden into your room and try to go in straight after showering with clean clothes
and friend of mine keeps slippers outside his room and changes into them to work in there,,,so he doesnt bring any thing in on his shoes... there are my most important lessions so fa

hope this helps