2018 is going to be a great year for cryptocurrencies. If you can, investing now would be a really good decision, in my opinion. Maybe wait for a local dip before you get in, or keep buying in smaller amounts to dollar cost average (google it if you're not familiar with the concept).
Actually I feel pretty much about the same about cryptocurrencies, not sure how it will be in 10 years or 3 years regarding cryptos but with all this hype made for sure 2018. would be good year to be in the field.
This is also a solid advice to with smaller amounts on the very start and spread while learning.
Yeah investing smaller amount in start will help you to manage your money in good way and the risk is also low at small amount but go for the right coin that will bring a lot to you and all this will be much more beneficial when person get experience with time and if you want to score good in crypto then invest into the best coin of the time and now bitcoin is best among the best so go for it and earn as much as you can.