Uploaded above are yajur veda upakarma mantrams.
If you are an Iyer in the US, chances are during the Upakarma days or the Avinyavattam days, you have to go to nearest temple or download mantrams in pdf format or videos and then repeat it.
Some of the mantras also change with year. It is essentially telling lord that in this year XXXX, these are my list of karmas etc. Much of it is in Sanskrit which is a difficult to learn but beautiful language - one of the, if not the, ancient language known to mankind.
Back to upakarma, the local temples follow various schools of rituals when it comes to upakarma. Some people are also hard pressed for time when the upakarma falls in one of the weekdays.
So to address all these issues, I got a copy from Giri Traders and scanned the relevant copies of Yajur Veda Upakarma... I am uploading it in this site for all to view or download. There are no copyright issues as most of these mantras are generic and can be written down from any vadhyar.
Few other additional helpful links for the yajur veda upakarmas are:
http://srivaishnavam.com/stotras/upakarma.htm
https://dl.dropboxusercontent.com/u/77580950/img008.jpg
https://dl.dropboxusercontent.com/u/77580950/img007.jpg
http://www.vadhyar.com/Upakarma%20Mantram.php