Ok....so I bought a short shifter about 400 years ago

I asked my boyfriend to put it on repetedly because at the time, he was off work for a few weeks and I had school and work (both full time)...so I gave him my car for an entire day when he finally said he would do it and took his. At the end of the day, no short shifter installed. He told me it was "too difficult". This is a guy who has replaced numerous engines and done everything you can thing of to a car, bodywise and enginewise. Maybe he was just being lazy but can someone please just tell me how to put it on my 99 teg ...is it that difficult? I just want the damn thing installed instead of sitting in my backseat!! Thanks