Moving from Financials Advisor to Vanguard - Tax question

[Kyle Collette]

Question for all the savvy investors with a little tax knowledge as well.

I have been looking to make the switch from my current investment portfolio into index funds. 

I was fortunate enough to start investing at a young age because of my parents, but I was more or less grandfathered in with a financial advisor for the last 8-10 years. Awesome guy and we have a great relationship, but I can’t jusitify staying with him and paying both a management fee as well as a fee per trade.

I currently have my Roth's IRA and my wife's Roth IRA with him as well as a much larger taxable account.

I want to make the move to vanguard with each of these accounts and was hoping for guidance on the best way to do so?

From my understanding, it should not be problematic to move the IRAs over as they are not subject to capital gains, correct?

However, for the taxable account, what would be my options to limit my tax basis (as well, how would I be able to calculate what my capital gains would be - is there a simple way to do so?)?

Any information or guidance is much appreciated!