I'd say at least two years of squatting experience where you squat at least two times every week, preferably more, before you start smolov. If you start it with less experience, and less work capacity, it could be wise to lower the pre-1RM with 10-15kg. You could also consider doing just the base meso cycle and not the entire program. However, if you go through with the entire program, you can expect to gain something like 25kg+ on your squat, I did it the first time and went from 172.5kg to 200kg. It was the hardest thing ever. And I worked myself so hard, that I lost motivation for training after completing it.
There is a smolov experience thread on this forum.
Read it, and google smolov, read everything you can, and spend at least a full week reading all that you can. Then, if you decide this is for you, make it number one priority in life, and do not be afraid of gaining fat. Eat, eat and then eat some more, do your squats, rest and sleep, and the mighty God of squats will bless you with an awesome strong squat, and your legs will turn into carjacks.
However, most people that do run smolov fail, for various reasons. Some alter the program, some add heavy deads (that's a killer), some eat too little, some just get killed by the volume, and some get acute injuries.
So it could be a gamble, if you go for it, you will most likely at times feel like you have no motivation to live, and you will be depressed and not feeling like you want to train, but oh the sweet taste of success when you make that PR-attempt after 3 months of incredible hard work.. That's so sweet, you cannot even imagine.
So if you have what it takes, do it..