Many users experience a reverse tolerance with salvia, ie, you trip harder the second time you do it. This was certainly true for me. The first time I did it (with 20X), I just leaned back and watched the ceiling do some weird things. The second time I did it, my ego was literally ripped to pieces, then put back together within the span of a few minutes.
Many dislike salvia, but I for one enjoy it. It's always confusing, unfamiliar, and sometimes a little frightening. For me, it's like a roller coaster ride. Another strange thing is that after taking it, I forgot that I smoked anything (this happened to my friend as well). Instead of thinking that the effects I felt were due to a drug, I though I was experiencing some new, strange reality.
I've done salvia alone a few times, and understand why you want to. The first time I tripped alone, I thought it would be different because I wouldn't have another consciousness to meld with (This thought occurred after I inhaled. Afterwards, I realized my stupidity). However, I would suggest that you have a sitter with you at least for the first time you break through.