So i have hammer moded about 50 times on my ahu during tuning and what not, i can tell you that the MOST off you will be is about 0.6. Ill get it exactly where i want it, and just the tightening of the bolts on the body will change it by usually +0.2-0.4 and the difference from one side of the scribe to the other was 0.2. So your at most 0.6 off from where you want. thats fine as normal range is 3-6, 3 is great for stock. My advice, just hammer mod the dang thing to a low number aka, once it start idleing a bit rough, tap it the other way so a tiny smidge so it idles smooth, DONE. you should be sitting around 1.8-2.8 give or take. 1.6-2.0 is where it starts to idle rough.
dont get me wrong, having the proper equipment is fantasic but for a daily driver with no mods and just general maintenance, you can save your self some hard cash by doing it this way. ALso do your timing belt by TDC then marking the belt and pullies with paint pen and reinstall new, you wont have to time it as it should be good.
Or just spend the few $$$ and get it. you have options.
There is a link somewhere here in the forums of the locations of people who have one who is usually willing to help out for a few beers.