for love or mind related problems use what DCP and nagesh_vejju talked about above your post.
for wealth and quick prosperity in business use sugarcane juice
i tried this on maasivaratri this year which fell on chaturdasi and had some hurdles and health problems for a week.
my experience suggests that avoid 2,7,9,14 thithis even if they are festivals
the exact time at which you do abhishek/archana are important.
most imp days : when SUN transits through ARUDRA star\'s 1st quarter(paada) , its called earth\'s mensus period.
its imp. to worship lord siva and chant his panchakshari mantra om namassivaaya during those 3-4 days, which usually come in 2nd half of june every yr.
** also the day with arudra star in december is holy